A Complete Resource Book in Chemistry for JEE Main

A.K. Singhal

Chapter 1

Basics of Chemistry - all with Video Answers

Educators

Chapter Questions

Problem 1

The number of significant figures for the three numbers $161 \mathrm{~cm}, 0.161 \mathrm{~cm}, 0.0161 \mathrm{~cm}$ are
(a) 2,3 and 4 respectively
(b) 3,3 and 3 respectively
(c) 3,5 and 4 respectively
(d) 3,4 and 4 respectively

Shahina -

Shahina -

Numerade Educator

Problem 2

What is the mass of $0.5$ moles of $\mathrm{O}_{3}$ molecules?
(a) $16 \mathrm{gm}$
(b) $20 \mathrm{gm}$
(c) $40 \mathrm{gm}$
(d) $24 \mathrm{gm}$

Shahina -

Numerade Educator

Problem 3

Which has maximum number of oxygen atoms?
(a) $1 \mathrm{gm}$ of $\mathrm{O}$
(b) $1 \mathrm{gm}$ of $\mathrm{O}_{2}$
(c) $1 \mathrm{gm}$ of $\mathrm{O}_{3}$
(d) All have same no.of O-atoms

Shahina -

Numerade Educator

Problem 4

A mole of any substance is related to
(a) number of particles
(b) volume of gaseous substances
(c) mass of a substance
(d) all of these

Shahina -

Numerade Educator

Problem 5

What is the weight of oxygen required for the complete combustion of $2.8 \mathrm{~kg}$ of ethylene?
(a) $9.6 \mathrm{~kg}$
(b) $6.9 \mathrm{~kg}$
(c) $96 \mathrm{~kg}$
(d) $6.8 \mathrm{~kg}$

Shahina -

Numerade Educator

Problem 6

The number of gram molecules of oxygen in $6.02 \times$ $10^{24} \mathrm{CO}$ molecules is
(a) 1 gm molecules
(b) 2 gm molecules
(c) 5 gm molecules
(d) 8 gm molecules

Shahina -

Numerade Educator

Problem 7

The number of oxygen atoms in $4.4 \mathrm{~g}$ of $\mathrm{CO}_{2}$ is
(a) $6 \times 10^{23}$
(b) $11 \times 10^{23}$
(c) $12 \times 10^{23}$
(d) $1.2 \times 10^{23}$

Shahina -

Numerade Educator

Problem 8

Boron has two stable isotopes, $\mathrm{B}^{10}(19 \%)$ and $\mathrm{B}^{11}$ ( $18 \%$ ) Find the average atomic weight of boron.
(a) $11.2$
(b) $10.8$
(c) $12.6$
(d) $9.6$

Narayan Hari

Numerade Educator

Problem 9

The number of moles of $\mathrm{KCl}$ in $1000 \mathrm{~mL}$ of 3 molar solution is
(a) 2
(b) 3
(c) 4
(d) 6

Shahina -

Numerade Educator

Problem 10

The specific heat of metal is $0.16$. Its atomic weight is
(a) $1.6$
(b) 16
(c) 32
(d) 48

Shahina -

Numerade Educator

Problem 11

The correct relationship between molecular mass and vapour density is
(a) V.D. $=2 \mathrm{M}$
(b) V.D. $=\frac{M}{2}$
(c) $\mathrm{M}=(\mathrm{V} \cdot \mathrm{D} .)^{\frac{1}{2}}$
(d) V.D. $=\mathrm{M}^{2}$

Shahina -

Numerade Educator

Problem 12

A bivalent metal has an equivalent mass of 32 , the molecular mass of metal nitrate is?
(a) 168
(b) 182
(c) 184
(d) 188

Shahina -

Numerade Educator

Problem 13

How many moles of potassium chlorate should be decomposed completely to obtain $67.2$ litres of oxygen at STP?
(a) 1
(b) 2
(c) 3
(d) 4

Shahina -

Numerade Educator

Problem 14

How many grams of phosphoric acid is required to complete neutralize $120 \mathrm{~g}$ of sodium hydroxide?
(a) $0.98$
(b) 98
(c) 89
(d) 49

Shahina -

Numerade Educator

Problem 15

The hydrated salt $\mathrm{Na}_{2} \mathrm{CO}_{3} \cdot \mathrm{n} \mathrm{H}_{2} \mathrm{O}$ undergoes $63 \%$ loss in mass on heating and becomes anhydrous. The value of $\mathrm{n}$ is
(a) 4
(b) 6
(c) 8
(d) 10

Shahina -

Numerade Educator

Problem 16

The vapour density of a mixture having $\mathrm{NO}_{2}$ and $\mathrm{N}_{2} \mathrm{O}_{4}$ is $27.6 .$ The mole fraction $\mathrm{NO}_{2}$ in the mixture is
(a) $1.6$
(b) $0.8$
(c) $2.4$
(d) $0.6$

Narayan Hari

Numerade Educator

Problem 17

Among the following pairs of compounds, the one that illustrates the law of multiple proportions is
(a) $\mathrm{Cu}$ and $\mathrm{CuSO}_{4}$
(b) $\mathrm{CuO}$ and $\mathrm{Cu}_{2} \mathrm{O}$
(c) $\mathrm{H}_{2} \mathrm{~S}$ and $\mathrm{SO}_{2}$
(d) $\mathrm{NH}_{3}$ and $\mathrm{NCl}_{3}$

Shahina -

Numerade Educator

Problem 18

How many grams of $\mathrm{KCl}$ must be added to $75 \mathrm{~g}$ of water to produce a solution with a molality of $2.25$
(a) $1.257 \mathrm{~g}$
(b) $125.7 \mathrm{~g}$
(c) $12.57 \mathrm{~g}$
(d) $25.14 \mathrm{~g}$

Narayan Hari

Numerade Educator

Problem 19

Normality of $0.04 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{4}$ is
(a) $0.02 \mathrm{~N}$
(b) $0.01 \mathrm{~N}$
(c) $0.04 \mathrm{~N}$
(d) $0.08 \mathrm{~N}$

Shahina -

Numerade Educator

Problem 20

Which among the following is the heaviest?
(a) one mole of oxygen
(b) one molecule of sulphur trioxide
(c) 100 amu of uranium
(d) $44 \mathrm{~g}$ of carbon dioxide

Shahina -

Numerade Educator

Problem 21

The empirical formula of a commercial ion exchange resin is $\mathrm{C}_{8} \mathrm{H}_{7} \mathrm{SO}_{3} \mathrm{Na}$. The resin can be used to soften water according to the reaction $\mathrm{Ca}^{+2}+2 \mathrm{C}_{8} \mathrm{H}_{7} \mathrm{SO}_{3} \mathrm{Na} \rightarrow$
$\left(\mathrm{C}_{8} \mathrm{H}_{7} \mathrm{SO}_{3}\right)_{2} \mathrm{Ca}+2 \mathrm{Na}^{+} .$What would be the maximum
uptake of $\overline{\mathrm{Ca}}^{+2}$ by the resin expressed in mole/g resin?
(a) $0.0024$
(b) $0.0246$
(c) $0.246$
(d) $24.6$

Muhammad Ahsan

Numerade Educator

Problem 22

A boy drinks $500 \mathrm{~mL}$ of $9 \%$ glucose solution. The number of glucose molecules he has consumed are $[$ mol. wt of glucose $=180]$
(a) $0.5 \times 10^{23}$
(b) $1.0 \times 10^{23}$
(c) $1.5 \times 10^{23}$
(d) $2.0 \times 10^{23}$

Shahina -

Numerade Educator

Problem 23

The pollution of $\mathrm{SO}_{2}$ in air is $10 \mathrm{ppm}$ by volume. The volume of $\mathrm{SO}_{2}$ per litre of air is
(a) $10^{-2} \mathrm{~mL}$
(b) $10^{-3} \mathrm{~mL}$
(c) $10^{-4} \mathrm{~mL}$
(d) $10^{-6} \mathrm{~mL}$

Maryam Shahid

Numerade Educator

Problem 24

The molarity of pure water is
(a) $55.56 \mathrm{M}$
(b) $5.56 \mathrm{M}$
(c) $1.0 \mathrm{M}$
(d) $0.01 \mathrm{M}$

Shahina -

Numerade Educator

Problem 25

The number of grams of a dibasic acid (molecular weight 200 ) present is $100 \mathrm{~mL}$ of its aqueous solution to give decinormal strength is
(a) $1 \mathrm{~g}$
(b) $2 \mathrm{~g}$
(c) $3 \mathrm{~g}$
(d) $4 \mathrm{~g}$

Shahina -

Numerade Educator

Problem 26

Normality of $0.3 \mathrm{M} \mathrm{H}_{3} \mathrm{PO}_{4}$ solution is
(a) $0.1 \mathrm{~N}$
(b) $0.45 \mathrm{~N}$
(c) $0.6 \mathrm{~N}$
(d) $0.9 \mathrm{~N}$

Shahina -

Numerade Educator

Problem 27

$2 \mathrm{~g}$ of $\mathrm{O}_{2}$ at NTP occupies the volume
(a) $1.4 \mathrm{~L}$
(b) $2.8 \mathrm{~L}$
(c) $11.4 \mathrm{~L}$
(d) $3.2 \mathrm{~L}$

Shahina -

Numerade Educator

Problem 28

The molecular weight of $\mathrm{O}_{2}$ and $\mathrm{SO}_{2}$ are 32 and 64 respectively. At $15^{\circ} \mathrm{C}$ and $150 \mathrm{~mm} \mathrm{Hg}$ pressure, one litre of $\mathrm{O}_{2}$ contains 'N' molecules. The number of molecules in two litres of $\mathrm{SO}_{2}$ under the same conditions of temperature and pressure will be
(a) $\mathrm{N}$
(b) $\frac{\mathrm{N}}{5}$
(c) $4 \mathrm{~N}$
(d) $2 \mathrm{~N}$

Maryam Shahid

Numerade Educator

Problem 29

7.5 gram of a gas occupies $5.6$ litres as STP. The gas is
(a) $\mathrm{CO}$
(b) NO
(c) $\mathrm{CO}_{2}$
(d) $\mathrm{N}, \mathrm{O}$

Shahina -

Numerade Educator

Problem 30

50 gram of calcium carbonate was completely burnt in air. What is the weight (in grams) of the residue?
(a) 28
(b) $2.8$
(c) 46
(d) $4.8$

Narayan Hari

Numerade Educator

Problem 31

At STP the density of a gas $(\mathrm{mol} . \mathrm{wt}=45)$ in $\mathrm{g} / \mathrm{L}$ is
(a) $11.2$
(b) 1000
(c) 2
(d) 224

Vishal Sharma

Numerade Educator

Problem 32

The amount of $\mathrm{NH}_{3}$ formed by the combustion of $2 \mathrm{~L}$ of $\mathrm{N}_{2}$ and $2 \mathrm{~L}$ of $\mathrm{H}_{2}$ is?
(a) $2 \mathrm{~L}$
(b) $1 \mathrm{~L}$
(c) $0.66 \mathrm{~L}$
(d) $1.33 \mathrm{~L}$

Maryam Shahid

Numerade Educator

Problem 33

How many moles of acidified $\mathrm{FeSO}_{4}$ can be completely oxidized by one mole of $\mathrm{KMnO}_{4}$ ?
(a) 20
(b) 10
(c) 5
(d) $0.5$

Shahina -

Numerade Educator

Problem 34

A compound possess $8 \%$ sulphur by mass. The least molecular mass is
(a) 200
(b) 400
(c) 155
(d) 355

Shahina -

Numerade Educator

Problem 35

The vapour density of ozone is
(a) 24
(b) 16
(c) 48
(d) 72

Shahina -

Numerade Educator

Problem 36

The weight of one molecule of a compound $\mathrm{C}_{60} \mathrm{H}_{122}$ is
(a) $1.3 \times 10^{-20} \mathrm{~g}$
(b) $5.01 \times 10^{-21} \mathrm{~g}$
(c) $3.72 \times 10^{23} \mathrm{~g}$
(d) $1.4 \times 10^{-21} \mathrm{~g}$

Vishal Sharma

Numerade Educator

Problem 37

$1000 \mathrm{~g}$ calcium carbonate solution contains $10 \mathrm{~g}$ carbonate. The concentration of solution is
(a) $10 \mathrm{ppm}$
(b) $100 \mathrm{ppm}$
(c) $1000 \mathrm{ppm}$
(d) $10,000 \mathrm{ppm}$

Vishal Sharma

Numerade Educator

Problem 38

One mole of $\mathrm{CH}_{4}$ contains
(a) $4.0 \mathrm{~g}$ atoms of hydrogen
(b) $3.0 \mathrm{~g}$ atom of carbon
(c) $6.02 \times 10^{23}$ atoms of hydrogen
(d) $1.81 \times 10^{23}$ molecules of $\mathrm{CH}_{4}$

Maryam Shahid

Numerade Educator

Problem 39

The amount of $\mathrm{O}_{2}$ for me a at N.T.P by the complete combastion of $1 \mathrm{~kg}$ coal is?
(a) $22.4 \mathrm{~L}$
(b) $2240 \mathrm{~L}$
(c) $1866 \mathrm{~L}$
(d) $100 \mathrm{~L}$

Narayan Hari

Numerade Educator

Problem 40

The maximum number of molecules is present in
(a) $15 \mathrm{~L}$ of $\mathrm{H}_{2}$ gas at STP
(b) $5 \mathrm{~L}$ of $\mathrm{N}_{2}$ gas at $\mathrm{STP}$
(c) $1.5 \mathrm{~g}$ of $\mathrm{H}_{2}$ gas
(d) $5 \mathrm{~g}$ of $\mathrm{O}_{2}$ gas

Vishal Sharma

Numerade Educator

Problem 41

Molarity of liquid $\mathrm{HCl}$ if density of solution is $1.17 \mathrm{~g} /$ $\mathrm{cc}$, is
(a) $32.05$
(b) $12.15$
(c) $3.05$
(d) $22.10$

Vishal Sharma

Numerade Educator

Problem 42

The incorrect statement for $14 \mathrm{~g}$ of $\mathrm{CO}$ is
(a) it occupies $2.24$ litre at NTP
(b) it corresponds to $0.5 \mathrm{~mol}$ of $\mathrm{CO}$
(c) it corresponds to same mol of $\mathrm{CO}$ and $\mathrm{N}_{2}$
(d) it corresponds to $3.01 \times 10^{23}$ molecules of $\mathrm{CO}$

Muhammad Ahsan

Numerade Educator

Problem 43

How many moles are present in $2.5$ litre of $0.2$ $\mathrm{MH}_{2} \mathrm{SO}_{4} ?$
(a) $0.25$
(b) $0.5$
(c) $0.75$
(d) $0.2$

Vishal Sharma

Numerade Educator

Problem 44

Which of the following statement is correct?
(a) 1 mole of electrons weighs $5.4 \mathrm{mg}$.
(b) 1 mole of electrons weighs $5.4 \mathrm{~kg}$
(c) 1 mole of electrons weighs $0.54 \mathrm{mg}$
(d) 1 mole of electrons has $1.6 \times 10^{-19} \mathrm{C}$ of charge

Narayan Hari

Numerade Educator

Problem 45

Which of the following pairs of gases contain equal number of molecules?
(a) $\mathrm{CO}_{2}$ and $\mathrm{NO}_{2}$
(b) $\mathrm{CO}$ and $(\mathrm{CN})_{2}$
(c) $\mathrm{NO}$ and $\mathrm{CO}$
(d) $\mathrm{N}_{2} \mathrm{O}$ and $\mathrm{CO}_{2}$

Vishal Sharma

Numerade Educator

Problem 46

The samples of $\mathrm{NaCl}$ are produced when Na combines separately with two isotopes of chlorine $\mathrm{Cl}^{35}$ and $\mathrm{Cl}^{37}$. Which law is illustrated?
(a) Law of constant volume
(b) Law of multiple proportions
(c) Law of reciprocal proportions
(d) None of these

Himanshu Kushwaha

Himanshu Kushwaha

Numerade Educator

Problem 47

Which of the following is the odd one with regard to mass?
(a) $1 \mathrm{~g}$ atom of sulphur
(b) $0.5$ moles of $\mathrm{CO}_{2}$
(c) 1 mole of $\mathrm{O}_{2}$
(d) $3 \times 10^{23}$ molecules of $\mathrm{SO}_{2}$

Narayan Hari

Numerade Educator

Problem 48

A breakfast cereal in advertised to contain $110 \mathrm{mg}$ of sodium per $100 \mathrm{~g}$ of the cereal. The per cent of sodium in the cereal is
(a) $0.110 \%$
(b) $0.0110 \%$
(c) $11.0 \%$
(d) $0.22 \%$

Shahina -

Numerade Educator

Problem 49

Express $145.6 \mathrm{~L}$ of chlorine in terms of gram moles.
(a) $6.5 \mathrm{~g}$ moles
(b) $4.5 \mathrm{~g}$ moles
(c) $0.65 \mathrm{~g}$ moles
(d) $9.5 \mathrm{~g}$ moles

Shahina -

Numerade Educator

Problem 50

The number of significant figures in $306.45$ and 40440 are respectively
(a) 4,5
(b) 5,5
(c) 5,4
(d) 4,6

Shahina -

Numerade Educator

Problem 51

The quantity of $\frac{\mathrm{PV}}{\mathrm{K}_{\mathrm{B}} \mathrm{T}}$ represents the
(a) molar mass of a gas
(b) number of molecules in a gas
(c) mass of gas
(d) number of moles of a gas

Shahina -

Numerade Educator

Problem 52

Which is the correct order of micro, nano, femto and pico here?
(a) micro $<$ nano $<$ pico $<$ femto
(b) pico $<$ femto $<$ nano $<$ micro
(c) femto $<$ pico $<$ nano $<$ micro
(d) femto $<$ nano $<$ micro $<$ pico

Shahina -

Numerade Educator

Problem 53

Find the number of atoms present in $0.016 \mathrm{~g}$ of methane.
(a) $0.5 \mathrm{~N}_{0}$
(b) $0.05 \mathrm{~N}_{0}$
(c) $\mathrm{N}_{0}$
(d) $1.6 \mathrm{~N}_{0}$

Vishal Sharma

Numerade Educator

Problem 54

15 litre atmosphere is equal to
(a) $1.515 \times 10^{8} \mathrm{erg}$
(b) $15.15 \times 10^{9} \mathrm{erg}$
(c) $1.515 \times 10^{10} \mathrm{erg}$
(d) $15.15 \times 10^{12} \mathrm{erg}$

Narayan Hari

Numerade Educator

Problem 55

If equal moles of water and urea are taken in a vessel what will be the mass percentage of urea in the solution?
(a) $22.086$
(b) $11.536$
(c) $46.146$
(d) $23.076$

Shahina -

Numerade Educator

Problem 56

Mixture $\mathrm{X}=0.02 \mathrm{~mol}$ of $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{SO}_{4}\right] \mathrm{Br}$ and
$\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Br}\right] \mathrm{SO}_{4}$ was prepared in 2 litre of solution. 1 litre of mixture $\mathrm{X}+\mathrm{excess} \mathrm{AgNO}_{3} \longrightarrow \mathrm{Y}$
1 litre of mixture $\mathrm{X}+$ excess $\mathrm{BaCl}_{2} \longrightarrow Z$ Number of moles of $\mathrm{Y}$ and $\mathrm{Z}$ are
(a) $0.02,0.01$
(b) $0.01,0.01$
(c) $0.01,0.02$
(d) $0.02,0.02$

Narayan Hari

Numerade Educator

Problem 57

At STP the density of $\mathrm{CCl}_{4}$ vapour in $\mathrm{g} / \mathrm{L}$ will be nearest to
(a) $8.67$
(b) $6.87$
(c) $5.67$
(d) $4.26$

Shahina -

Numerade Educator

Problem 58

The amount of zinc required to produce $224 \mathrm{~mL}$ of $\mathrm{H}_{2}$ at STP on treatment with dilute $\mathrm{H}_{2} \mathrm{SO}_{4}$ will be $(Z n=65)$
(a) $65.0 \mathrm{~g}$
(b) $0.65 \mathrm{~g}$
(c) $6.35 \mathrm{~g}$
(d) $0.065 \mathrm{~g}$

Shahina -

Numerade Educator

Problem 59

Ratio of $\mathrm{C}_{\mathrm{p}}$ and $\mathrm{C}_{\mathrm{v}}$ of a gas ' $\mathrm{X}^{\prime}$ is $1.4$. The number of atoms of the gas ' $\mathrm{X}$ ' present in $11.2$ litres of it at NTP will be
(a) $6.02 \times 10^{21}$
(b) $60.2 \times 10^{23}$
(c) $6.02 \times 10^{23}$
(d) $1.02 \times 10^{23}$

Shahina -

Numerade Educator

Problem 60

When $18 \mathrm{~g}$ of glucose is dissolved in $180 \mathrm{~g}$ of water then the mole fraction of glucose is
(a) $0.0099$
(b) $0.0999$
(c) $0.9999$
(d) $0.9111$

Shahina -

Numerade Educator

Problem 61

The weight of $1 \times 10^{22}$ molecules of $\mathrm{CuSO}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}$ is
(a) $42.42 \mathrm{~g}$
(b) $41.42 \mathrm{~g}$
(c) $44.44 \mathrm{~g}$
(d) $48.94 \mathrm{~g}$

Shahina -

Numerade Educator

Problem 62

If $\mathrm{N}_{\mathrm{A}}$ is Avogadro's number then number of valence electrons in $4.2 \mathrm{~g}$ of nitride ions $\left(\mathrm{N}^{3}\right)$ is
(a) $3.2 \mathrm{~N}_{\mathrm{A}}$
(b) $1.6 \mathrm{~N}_{\mathrm{A}}$
(c) $2.4 \mathrm{~N}_{\mathrm{A}}$
(d) $1.2 \mathrm{~N}_{\mathrm{A}}$

Shahina -

Numerade Educator

Problem 63

In the final answer of the expression
$$
\frac{(29.2-20.2)\left(1.79 \times 10^{5}\right)}{1.37}
$$
The number of significant figures is
(a) 2
(b) 4
(c) 6
(d) 7

Shahina -

Numerade Educator

Problem 64

What is the molarity of $\mathrm{H}_{2} \mathrm{SO}_{4}$ solution that has a density $1.84 \mathrm{~g} / \mathrm{cc}$ at $35^{\circ} \mathrm{C}$ and contains $98 \% \mathrm{H}_{2} \mathrm{SO}_{4}$ by weight?
(a) $1.84 \mathrm{M}$
(b) $81.4 \mathrm{M}$
(c) $18.4 \mathrm{M}$
(d) $184 \mathrm{M}$

Shahina -

Numerade Educator

Problem 65

The number of moles of oxygen in one litre of air containing $21 \%$ oxygen by volume, in standard conditions, is
(a) $0.176 \mathrm{~mol}$
(b) $0.32 \mathrm{~mol}$
(c) $0.0093 \mathrm{~mol}$
(d) $2.20 \mathrm{~mol}$

Shahina -

Numerade Educator

Problem 66

Number of atoms in $4.25 \mathrm{~g}$ of $\mathrm{NH}_{3}$ is approximately
(a) $6 \times 10^{23}$
(b) $15 \times 10^{23}$
(c) $1.5 \times 10^{23}$
(d) $2.5 \times 10^{23}$

Shahina -

Numerade Educator

Problem 67

The weight of one molecules of a compound $\mathrm{C}_{60} \mathrm{H}_{122}$ is
(a) $5.005 \times 10^{23} \mathrm{~g}$
(b) $6.023 \times 10^{23} \mathrm{~g}$
(c) $4.1 \times 10^{-21} \mathrm{~g}$
(d) $1.4 \times 10^{-21} \mathrm{~g}$

Shahina -

Numerade Educator

Problem 68

The percentage weight of $\mathrm{Zn}$ in white vitriol $\left[\mathrm{ZnSO}_{4} \cdot 7 \mathrm{H}_{2} \mathrm{O}\right]$ is approximately equal to $(\mathrm{Zn}=65$
$\mathrm{S}=32, \mathrm{O}=16$ and $\mathrm{H}=1$ )
(a) $21.56 \%$
(b) $32.58 \%$
(c) $22.65 \%$
(d) $26.55 \%$

Shahina -

Numerade Educator

Problem 69

A gaseous mixture contains $\mathrm{O}_{2}$ and $\mathrm{N}_{2}$ in the ratio $1: 4$ by weight. Then the ratio of their number of molecules in the mixture is
(a) $3: 32$
(b) $7: 32$
(c) $1: 4$
(d) $3: 16$

Shahina -

Numerade Educator

Problem 70

$1 \mathrm{cc} \mathrm{N}_{2} \mathrm{O}$ at NTP contains
(a) $\frac{1.32}{224} \times 10^{23}$ electrons
(b) $\frac{6.02}{22400} \times 10^{23}$ molecules
(c) $\frac{1.8}{224} \times 10^{22}$ atoms
(d) all of these

Narayan Hari

Numerade Educator

Problem 71

$0.30 \mathrm{~g}$ of a volatile liquid displaces $90.0 \mathrm{~cm}^{3}$ of air at STP in the Victor Meyer's method. The molecular mass of the liquid is
(a) $54.44 \mathrm{~g}$
(b) $34.64 \mathrm{~g}$
(c) $64.76 \mathrm{~g}$
(d) $74.66 \mathrm{~g}$

Himanshu Kushwaha

Himanshu Kushwaha

Numerade Educator

Problem 72

A 5 molar solution of $\mathrm{H}_{2} \mathrm{SO}_{4}$ is diluted from 1 litre to a volume of 10 litres, the normality of the solution will be
(a) $0.5 \mathrm{~N}$
(b) $1 \mathrm{~N}$
(c) $2.5 \mathrm{~N}$
(d) $5 \mathrm{~N}$

Shahina -

Numerade Educator

Problem 73

If $0.50$ mole of $\mathrm{BaCl}_{2}$ is mixed with $0.20 \mathrm{~mole}$ of $\mathrm{Na}_{3} \mathrm{PO}_{4}$, the maximum number of moles of $\mathrm{Ba}_{3}\left(\mathrm{PO}_{4}\right)_{2}$
that can be formed is
(a) $0.10$
(b) $0.20$
(c) $0.30$
(d) $0.40$

Narayan Hari

Numerade Educator

Problem 74

The equivalent weight of $\mathrm{MnSO}_{4}$ is half its molecular weight when it is converted to
(a) $\mathrm{MnO}$
(b) $\mathrm{MnO}_{4}^{2-}$
(c) $\mathrm{MnO}_{2}$
(d) $\mathrm{MnO}_{4}^{-}$

Shahina -

Numerade Educator

Problem 75

An aqueous solution of $6.3 \mathrm{~g}$ oxalic acid dehydrate is made up to $250 \mathrm{ml}$. The volume of $0.1 \mathrm{~N} \mathrm{NaOH}$ required to completely neutralize $10 \mathrm{~mL}$ of this solution is
(a) $4 \mathrm{~mL}$
(b) $20 \mathrm{~mL}$
(c) $40 \mathrm{~mL}$
(d) $60 \mathrm{~mL}$

Shahina -

Numerade Educator

Problem 76

In the standardization of $\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}$ using $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ by iodometry, the equivalent weight of $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ is
(a) same as mol. wt
(b) $\frac{\text { mol. wt }}{2}$
(c) $\frac{\text { mol. wt }}{4}$
(d) $\frac{\text { mol } w t}{6}$

Narayan Hari

Numerade Educator

Problem 77

The number of molecules in $4.25 \mathrm{~g}$ of ammonia is
(a) $1.5 \times 10^{23}$
(b) $2.5 \times 10^{23}$
(c) $3.5 \times 10^{23}$
(d) $15 \times 10^{23}$

Narayan Hari

Numerade Educator

Problem 78

The volume in litres of $\mathrm{CO}_{2}$ liberated at STP, when log of $90 \%$ pure limestone is heated completely is
(a) $2.24$
(b) $22.4$
(c) $2.016$
(d) $20.16$

Narayan Hari

Numerade Educator

Problem 79

The weight of a single atom of oxygen is
(a) $5.057 \times 10^{23} \mathrm{~g}$
(b) $1.556 \times 10^{23} \mathrm{~g}$
(c) $2.656 \times 10^{-23} \mathrm{~g}$
(d) $4.538 \times 10^{-23} \mathrm{~g}$

Narayan Hari

Numerade Educator

Problem 80

From the complete decomposition of $20 \mathrm{~g} \mathrm{CaCO}_{3}$ at STP the volume of $\mathrm{CO}_{2}$ obtained is
(a) $2.24 \mathrm{~L}$
(b) $4.48 \mathrm{~L}$
(c) $44.8 \mathrm{~L}$
(d) $48.4 \mathrm{~L}$

Vishal Sharma

Numerade Educator

Problem 81

$5 \mathrm{~g}$ of $\mathrm{CH}_{3} \mathrm{COOH}$ is dissolved in one litre of ethanol. Suppose there is no reaction between them. If the density of ethanol is $0.789 \mathrm{~g} / \mathrm{mL}$ then the molality of resulting solution is
(a) $0.0256$
(b) $0.1056$
(c) $1.1288$
(d) $0.2076$

Maryam Shahid

Numerade Educator

Problem 82

$800 \mathrm{~g}$ of a $40 \%$ solution by weight was cooled. $100 \mathrm{~g}$ of solute precipitated. The percentage composition of remaining solution is
(a) $31.4 \%$
(b) $57.6 \%$
(c) $45.8 \%$
(d) $41.4 \%$

Muhammad Ahsan

Numerade Educator

Problem 83

$0.25 \mathrm{~mol}$ of $\mathrm{P}_{4}$ molecules contains ___ atoms.
(a) $1.764 \times 10^{23}$
(b) $6.02 \times 10^{19}$
(c) $6.023 \times 10^{23}$
(d) $8.086 \times 10^{23}$

Vishal Sharma

Numerade Educator

Problem 84

How many grams of $\mathrm{CH}_{3} \mathrm{OH}$ would have to be added to water to prepare $150 \mathrm{~mL}$ of a solution that is $2.0 \mathrm{M}$ $\mathrm{CH}_{3} \mathrm{OH} ?$
(a) $9.6 \mathrm{~g}$
(b) $906 \mathrm{~g}$
(c) $4.3 \times 10^{2} \mathrm{~g}$
(d) $9.6 \times 10^{3} \mathrm{~g}$

Vishal Sharma

Numerade Educator

Problem 85

The oxide of an element contains $67.67 \%$ of oxygen and the vapour density of its volatile chloride is 79 . Equivalent weight of the element is
(a) $2.46$
(b) $3.82$
(c) $4.36$
(d) $4.96$

Muhammad Ahsan

Numerade Educator

Problem 86

The molar concentration of $20 \mathrm{~g}$ of $\mathrm{NaOH}$ present in 5 litre of solution is
(a) $0.1 \mathrm{~mol} / \mathrm{L}$
(b) $0.2 \mathrm{~mol} / \mathrm{L}$
(c) $\mathrm{v} 1.0 \mathrm{~mol} / \mathrm{L}$
(d) $2.0 \mathrm{~mol} / \mathrm{L}$

Vishal Sharma

Numerade Educator

Problem 87

Volume of a gas at NTP is $1.12 \times 10^{-7} \mathrm{cc}$. The number of molecules in it is
(a) $3.01 \times 10^{12}$
(b) $3.01 \times 10^{18}$
(c) $3.01 \times 10^{24}$
(d) $3.01 \times 10^{30}$

Vishal Sharma

Numerade Educator

Problem 88

Maximum number of molecules will be in
(a) $1 \mathrm{~g}$ of $\mathrm{H}_{2}$
(b) $10 \mathrm{~g}$ of $\mathrm{H}_{2}$
(c) $22 \mathrm{~g}$ of $\mathrm{O}_{2}$
(d) $44 \mathrm{~g}$ of $\mathrm{CO}_{2}$

Narayan Hari

Numerade Educator

Problem 89

Haemoglobin contains $0.33 \%$ of iron by weight. The molecular weight of haemoglobin is approximately 67200 . The number of iron atom (at. wt of $\mathrm{Fe}$ is 56 ) present in one molecule of haemoglobin are
(a) 1
(b) 6
(c) 4
(d) 2

Narayan Hari

Numerade Educator

Problem 90

The equivalent weight of phosphoric acid $\left(\mathrm{H}_{3} \mathrm{PO}_{4}\right)$ in the reaction:
$\mathrm{NaOH}+\mathrm{H}_{3} \mathrm{PO}_{4} \longrightarrow \mathrm{NaH}_{2} \mathrm{PO}_{4}+\mathrm{H}_{2} \mathrm{O}$ is
(a) 89
(b) 98
(c) 59
(d) 29

Narayan Hari

Numerade Educator

Problem 91

$2.76 \mathrm{~g}$ of silver carbonate (At. mass of $\mathrm{Ag}=108$ ) on being heated strongly yields a reduce weigh
(a) $2.32 \mathrm{~g}$
(b) $3.32 \mathrm{~g}$
(c) $1.36 \mathrm{~g}$
(d) $0.32$

Narayan Hari

Numerade Educator

Problem 92

$4 \mathrm{~g}$ caustic soda is dissolved in $100 \mathrm{cc}$ of solution. The normality of solution is
(a) 1
(b) $0.8$
(c) $0.6$
(d) $0.10$

Vishal Sharma

Numerade Educator

Problem 93

When a mixture of $\mathrm{Na}_{2} \mathrm{CO}_{3}$ and $\mathrm{NaH} \mathrm{CO}_{3}$ was heated at $423 \mathrm{~K} 112 \mathrm{ml}$ of $\mathrm{CO}_{2}$ was formed only. What is the $\%$ of $\mathrm{Na}_{2} \mathrm{CO}_{3}$ here in the mixture?
(a) $84 \%$
(b) $16 \%$
(c) $32 \%$
(d) $68 \%$

Narayan Hari

Numerade Educator

Problem 94

The mass of $\mathrm{BaCO}_{3}$ formed where excess of $\mathrm{CO}_{2}$ is passed through a solution having $0.205$ mole of Ba $(\mathrm{OH})_{2}$ is?
(a) $40.5 \mathrm{gm}$
(b) $20.25 \mathrm{gm}$
(c) $81 \mathrm{gm}$
(d) $4.05 \mathrm{gm}$

Narayan Hari

Numerade Educator

Problem 95

120 gram of urea is present in 5 litre of solution. The active mass of urea is
(a) $0.06$
(b) $0.2$
(c) $0.4$
(d) $1.4$

Vishal Sharma

Numerade Educator

Problem 96

The normality of orthophosphoric acid having purity of $70 \%$ be weight and specific gravity $1.54$ is
(a) $11 \mathrm{~N}$
(b) $22 \mathrm{~N}$
(c) $33 \mathrm{~N}$
(d) $44 \mathrm{~N}$

Muhammad Ahsan

Numerade Educator

Problem 97

$10^{21}$ molecules are removed from $200 \mathrm{mg}$ of $\mathrm{CO}_{2}$. The moles of $\mathrm{CO}_{2}$ left are
(a) $2.88 \times 10^{-3}$
(b) $28.8 \times 10^{-3}$
(c) $288 \times 10^{-3}$
(d) $28.8 \times 10^{3}$

Vishal Sharma

Numerade Educator

Problem 98

What is the volume (in litres) of oxygen at STP required for complete combustion of $32 \mathrm{~g}$ of $\mathrm{CH}_{4}$ ? (mol. wt of $\mathrm{CH}_{4}=16$ )
(a) $89.6$
(b) $189.6$
(c) $98.4$
(d) $169.5$

Narayan Hari

Numerade Educator

Problem 99

Two grams of sulphur is completely burnt in oxygen to form $\mathrm{SO}_{2}$, In this reaction, what is the volume (in litres) of oxygen consumed at STP? (At. wt of sulphur and oxygen are 32 and 16 respectively)
(a) $\frac{22.414}{16}$
(b) $\frac{16}{22.441}$
(c) $\frac{32.414}{18}$
(d) $\frac{42.414}{16}$

Shahina -

Numerade Educator

Problem 100

How many water molecules are there in one drop of water (volume $=0.0018 \mathrm{~mL}$ ) at room temperature?
(a) $4.86 \times 10^{17}$
(b) $6.023 \times 10^{24}$
(c) $2.584 \times 10^{19}$
(d) $6.023 \times 10^{19}$

Narayan Hari

Numerade Educator

Problem 101

'X' litres of carbon monoxide is present at STP. It is completely oxidized to $\mathrm{CO}_{2} .$ The volume of $\mathrm{CO}_{2}$ formed is $11.207$ litres at STP. What is the value of ' $\mathrm{X}$ ' in litres?
(a) $32.2$
(b) $21.2$
(c) $10.2$
(d) $11.2$

Shahina -

Numerade Educator

Problem 102

Which has maximum number of molecules?
(a) $7 \mathrm{~g} \mathrm{~N}_{2}$
(b) $2 \mathrm{~g} \mathrm{H}_{2}$
(c) $18 \mathrm{~g} \mathrm{NO}_{2}$
(d) $16 \mathrm{~g} \mathrm{O}_{2}$

Shahina -

Numerade Educator

Problem 103

One mole of fluorine is reacted with two mole of hot and concentrated KOH. The products formed are $\mathrm{KF}, \mathrm{H}_{2} \mathrm{O}$ and $\mathrm{O}_{2} .$ The molar ratio of $\mathrm{KF}, \mathrm{H}_{2} \mathrm{O}$ and $\mathrm{O}_{2}$
respectively is
(a) $1: 2: 1$
(b) $1: 2: 2$
(c) $0.5: 1: 2$
(d) $2: 1: 0.5$

Shahina -

Numerade Educator

Problem 104

The total number of protons in $10 \mathrm{~g}$ of calcium carbonate is $\left(\mathrm{N}_{0}=6.023 \times 10^{25}\right)$
(a) $3.01 \times 10^{24}$
(b) $4.06 \times 10^{24}$
(c) $30.1 \times 10^{24}$
(d) $3.01 \times 10^{23}$

Shahina -

Numerade Educator

Problem 105

What is the volume (in litre) of oxygen required at STP to completely convert $1.5$ moles of sulphur to sulphur dioxide?
(a) $33.6$
(b) $43.6$
(c) $11.2$
(d) $23.6$

Shahina -

Numerade Educator

Problem 106

In acidic medium, dichromate ion oxidize ferrous ion to ferric ion. If the gram molecular weight of potassium dichromate is $294 \mathrm{~g}$, its equivalent weight is
(a) 19
(b) 49
(c) 99
(d) 294

Shahina -

Numerade Educator

Problem 107

$10 \mathrm{~g}$ of $\mathrm{CaCO}_{3}$ is completely decomposed to $\mathrm{X}$ and $\mathrm{CaO} . \mathrm{X}$ is passed into an aqueous solution containing one mole of sodium carbonate. What is the number of moles of sodium bicarbonate formed? (Mol. wt of $\mathrm{CaCO}_{3}=100, \mathrm{Na}_{2} \mathrm{CO}_{3}=106$
$\left.\mathrm{NaHCO}_{3}=84\right)$
(a) $0.010$
(b) $0.2$
(c) $0.4$
(d) 10

Shahina -

Numerade Educator

Problem 108

The mass of carbon anode consumed (giving only $\mathrm{CO}_{2}$ ) in the production of $270 \mathrm{~kg}$ of aluminium metal from bauxite by the Hall process is (atomic mass of $\mathrm{Al}=27$ )
(a) $180 \mathrm{~kg}$
(b) $270 \mathrm{~kg}$
(c) $145 \mathrm{~kg}$
(d) $90 \mathrm{~kg}$

Shahina -

Numerade Educator

Problem 109

The number of moles of $\mathrm{KMnO}_{4}$ reduced by one mole of KI in alkaline medium is
(a) 2
(b) 1
(c) 5
(d) 6

Shahina -

Numerade Educator

Problem 110

How many grams of dibasic acid (mol. wt 200) should be present in $100 \mathrm{~mL}$ of the aqueous solution to give $0.1$ normality?
(a) $1 \mathrm{~g}$
(b) $1.5 \mathrm{~g}$
(c) $0.5 \mathrm{~g}$
(d) $20 \mathrm{~g}$

Shahina -

Numerade Educator

Problem 111

'X' gram of calcium carbonate was completely burnt in air. The weight of solid residue formed is $28 \mathrm{~g}$. What is the value of ' $\mathrm{X}$ ' (in grams)?
(a) 50
(b) 100
(c) 150
(d) 200

Shahina -

Numerade Educator

Problem 112

One mole of acidified $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ on reaction with excess KI will liberate $\ldots \ldots$ moles (s) of $\mathrm{I}_{2}$.
(a) 2
(b) 3
(c) 6
(d) 7

Shahina -

Numerade Educator

Problem 113

$0.59 \mathrm{~g}$ of the silver salt of an organic acid (molar mass 210 ) on ignition gave $0.36 \mathrm{~g}$ of pure silver. The basicity of the acid is
(a) 2
(b) 3
(c) 4
(d) 5

Shahina -

Numerade Educator

Problem 114

$\mathrm{KMnO}_{4}(\mathrm{~mol} . \mathrm{wt}=158)$ oxidizes oxalic acid in acidic medium to $\mathrm{CO}_{2}$ and water as follows. $5 \mathrm{C}_{2} \mathrm{O}_{4}^{2-}+2 \mathrm{MnO}_{4}^{-}+16 \mathrm{H}^{+} \longrightarrow 10 \mathrm{CO}_{2}+$ $2 \mathrm{Mn}^{2+}+8 \mathrm{H}_{2} \mathrm{O}$
What is the equivalent weight of $\mathrm{KMnO}_{4} ?$
(a) 158
(b) $31.6$
(c) $39.5$
(d) 79

Shahina -

Numerade Educator

Problem 115

Sodium bicarbonate on heating decomposes to form sodium carbonate, $\mathrm{CO}_{2}$ and water. If $0.2$ moles of sodium bicarbonate is completely decomposed, how many moles of sodium carbonate is formed?
(a) $0.1$
(b) $0.2$
(c) $0.05$
(d) $0.025$

Shahina -

Numerade Educator

Problem 116

A purified pepsin was subjected to amino acid analysis. The amino acid present in the smallest amount was lysine, $\mathrm{C}_{6} \mathrm{H}_{14} \mathrm{~N}_{2} \mathrm{O}_{2}$ and the amount of lysine was found to be $0.431 \mathrm{~g}$ per $100 \mathrm{~g}$ of protein. The minimum molecular mass of protein is
(a) $34 \mathrm{u}$
(b) $3400 \mathrm{u}$
(c) $34,000 \mathrm{u}$
(d) $3400,000 \mathrm{u}$

Shahina -

Numerade Educator

Problem 117

Find the number of valence electrons present in $0.53$ gram of $\mathrm{Na}_{2} \mathrm{CO}_{3}$.
(a) $3.01 \times 10^{23}$
(b) $1.2046 \times 10^{23}$
(c) $12.046 \times 10^{23}$
(d) $6.023 \times 10^{23}$

Narayan Hari

Numerade Educator

Problem 118

Given below is the graphical representation of volumes occupied by several gases at STP find out which gas/gases is/are not placed at the correct position?
(a) $\mathrm{He}, \mathrm{NH}_{3}$
(b) $\mathrm{CH}_{4}, \mathrm{He}$
(c) $\mathrm{NH}_{3}, \mathrm{H}_{2}$
(d) $\mathrm{NH}_{3}, \mathrm{CH}_{4}$

Shahina -

Numerade Educator

Problem 119

If $3.02 \times 10^{19}$ molecules are removed from $98 \mathrm{mg}$ of $\mathrm{H}_{2} \mathrm{SO}_{4}$, then the number of moles of $\mathrm{H}_{2} \mathrm{SO}_{4}$ left are
(a) $0.1 \times 10^{-3}$
(b) $5 \times 10^{-4}$
(c) $1.2 \times 10^{-4}$
(d) $1.5 \times 10^{-3}$

Shahina -

Numerade Educator

Problem 120

A metal oxide has the formula $\mathrm{M}_{2} \mathrm{O}_{3} .$ It can be reduced by hydrogen to give free metal and water. $0.1595 \mathrm{~g}$ of the metal oxide requires $6 \mathrm{mg}$ of hydrogen for complete reduction. What is the atomic weight of metal?
(a) $54.4$
(b) $46.56$
(c) $55.8$
(d) $58.5$

Shahina -

Numerade Educator

Problem 121

A chloride of a metal (M) has $65.5 \%$ of chlorine. 100 $\mathrm{ml}$ of vapour of the chloride of metal at STP weighs $0.72 \mathrm{~g}$. The molecular formula of this metal chloride is
(a) $\mathrm{MCl}_{3}$
(b) $\mathrm{MCl}_{4}$
(c) $\mathrm{M}_{2} \mathrm{Cl}_{3}$
(d) $\mathrm{MCl}_{3}$

Shahina -

Numerade Educator

Problem 122

The strength of $0.01 \mathrm{M} \mathrm{Na}_{2} \mathrm{CO}_{3}$ solution in terms of molality is nearly $\quad$ when the density of the solution is $1.1 \mathrm{~g} / \mathrm{mL}$
(a) $9 \times 10^{-3}$
(b) $1.8 \times 10^{-3}$
(c) $4.5 \times 10^{-3}$
(d) $1.1 \times 10^{-3}$

Narayan Hari

Numerade Educator

Problem 123

One mole of magnesium in the vapour state absorbed $1200 \mathrm{~kJ} \mathrm{~mol}^{-1}$ of energy. If the first and second ionization energies of $\mathrm{Mg}$ are 750 and $1450 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively, the final composition of the mixture is
(a) $86 \% \mathrm{Mg}^{+}+14 \% \mathrm{Mg}^{2+}$
(b) $36 \% \mathrm{Mg}^{+}+64 \% \mathrm{Mg}^{2+}$
(c) $69 \% \mathrm{Mg}^{+}+31 \% \mathrm{Mg}^{2+}$
(d) $31 \% \mathrm{Mg}^{+}+69 \% \mathrm{Mg}^{2+}$

Shahina -

Numerade Educator

Problem 124

A metal oxide has the formula $\mathrm{Z}_{2} \mathrm{O}_{3}$. It can be reduced by hydrogen to give free metal and water. $0.1596 \mathrm{~g}$ of the metal oxide requires $6 \mathrm{mg}$ of hydrogen for complete reduction. The atomic weight of the metal is
(a) $55.8$
(b) $65.8$
(c) $6.58$
(d) $15.9$

Shahina -

Numerade Educator

Problem 125

The volume of carbon dioxide gas evolved at STP by heating $7.3 \mathrm{~g}$ of $\mathrm{Mg}\left(\mathrm{HCO}_{3}\right)_{2}$ will be
(a) $1100 \mathrm{~mL}$
(b) $1120 \mathrm{~mL}$
(c) $2230 \mathrm{~mL}$
(d) $3240 \mathrm{~mL}$

Narayan Hari

Numerade Educator

Problem 126

The amount of Zinc (atomic weight $=65$ ) necessary to produce $224 \mathrm{~mL}$ of $\mathrm{H}_{2}$ by the reaction with an acid will be
(a) $0.65 \mathrm{~g}$
(b) $7.6 \mathrm{~g}$
(c) $6.5 \mathrm{~g}$
(d) $8.5 \mathrm{~g}$

Shahina -

Numerade Educator

Problem 127

Assuming fully decomposed, the volume of $\mathrm{CO}_{2}$ released at STP on heating $9.85 \mathrm{~g}$ of $\mathrm{BaCO}_{3}$ (atomic mass, $\mathrm{Ba}=137$ ) will be
(a) $1.12 \mathrm{~L}$
(b) $4.84 \mathrm{~L}$
(c) $2.12 \mathrm{~L}$
(d) $2.06 \mathrm{~L}$

Shahina -

Numerade Educator

Problem 128

Specific volume of cylindrical virus particle is $6.02 \times$ $10^{-2} \mathrm{cc} / \mathrm{g}$. Whose radius and length are $7 \AA$ and $10 \AA$ respectively. If $\mathrm{N}_{\mathrm{A}}=6.02 \times 10^{23}$, find molecular weight of virus
(a) $15.4 \mathrm{~kg} / \mathrm{mol}$
(b) $1.54 \times 10^{4} \mathrm{~kg} / \mathrm{mol}$
(c) $4.68 \times 10^{4} \mathrm{~kg} / \mathrm{mol}$
(d) $2.08 \times 10^{3} \mathrm{~kg} / \mathrm{mol}$

Shahina -

Numerade Educator

Problem 129

$500 \mathrm{~mL}$ of $\mathrm{NH}_{3}$ contains $6.0 \times 10^{23}$ molecules at STP. How many molecules are present in $100 \mathrm{~mL}$ of $\mathrm{CO}_{2}$ at STP?
(a) $6 \times 10^{23}$
(b) $1.5 \times 10^{23}$
(c) $1.2 \times 10^{23}$
(d) none of these

Shahina -

Numerade Educator

Problem 130

In the reaction, $4 \mathrm{NH}_{3}+5 \mathrm{O}_{2} \longrightarrow 4 \mathrm{NO}+6 \mathrm{H}_{2} \mathrm{O}$, when one mole of ammonia and one mole of oxygen are made to react to completion, then
(a) $1.0 \mathrm{~mol}$ of $\mathrm{H}_{2} \mathrm{O}$ is produced
(b) all the oxygen is consumed
(c) $1.5 \mathrm{~mol}$ of $\mathrm{NO}$ is formed
(d) all the ammonia is consumed

Shahina -

Numerade Educator

Problem 131

The number of gram molecules of oxygen in $6.02 \times$ $10^{24} \mathrm{CO}$ molecules is
(a) $10 \mathrm{~g}$ molecules
(b) $5 \mathrm{~g}$ molecules
(c) 1 g molecules
(d) $0.5 \mathrm{~g}$ molecules

Narayan Hari

Numerade Educator

Problem 132

The number of oxalic acid molecules in $100 \mathrm{ml}$ of $0.02$ N oxalic acid solution is
(a) $6.023 \times 10^{22}$
(b) $10^{-3}$
(c) $6.022 \times 10^{20}$
(d) none of these

Shahina -

Numerade Educator

Problem 133

In the reaction $4 \mathrm{NH}_{3}(\mathrm{~g})+5 \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow 4 \mathrm{NO}(\mathrm{g})+6 \mathrm{H}_{2} \mathrm{O}(1)$ when $1 \mathrm{~mol}$ of ammonia and $1 \mathrm{~mol}$ of $\mathrm{O}_{2}$ are made to react to completion then
(a) $1.0 \mathrm{~mol}$ of $\mathrm{H}_{2} \mathrm{O}$ is produced
(b) $1.0 \mathrm{~mol}$ of NO will be produced
(c) all the ammonia will be consumed
(d) all the oxygen will be consumed

Shahina -

Numerade Educator

Problem 134

Pressure in a mixture of $4 \mathrm{~g}$ of $\mathrm{O}_{2}$ and $2 \mathrm{~g}$ of $\mathrm{H}_{2}$ confined in a container of 1 litre capacity at $0{ }^{\circ} \mathrm{C}$ is
(a) $25.2 \mathrm{~atm}$
(b) $35.6 \mathrm{~atm}$
(c) $15.4 \mathrm{~atm}$
(d) $48.2 \mathrm{~atm}$

Shahina -

Numerade Educator

Problem 135

What is the volume (in litres) of $\mathrm{CO}_{2}$ liberated at STP, when $2.12$ gram of sodium carbonate (mol. $\mathrm{wt}=106$ ) is treated with excess dilute $\mathrm{HCl}$ ?
(a) $11.2$
(b) $2.12$
(c) $0.448$
(d) $4.26$

Shahina -

Numerade Educator

Problem 136

Percentage of Se in peroxidase anhydrous enzyme is $0.5 \%$ by weight (at. wt $=78.4$ ) then minimum molecular weight of peroxidase anhydrous enzymes is
(a) $1.568 \times 10^{3}$
(b) $1.568 \times 10^{4}$
(c) $25.68$
(d) $4.316 \times 10^{4}$

Shahina -

Numerade Educator

Problem 137

For the formation of $3.65 \mathrm{gm}$ of $\mathrm{HCl}$, what volume of $\mathrm{H}_{2}$, and $\mathrm{Cl}_{2}$ are needed at N.T.P?
(a) $1.12 \mathrm{~L}, 1.12 \mathrm{~L}$
(b) $1.12 \mathrm{~L}, 2.24 \mathrm{~L}$
(c) $3.65 \mathrm{~L}, 1.83 \mathrm{~L}$
(d) $1 \mathrm{~L}, 1 \mathrm{~L}$

Narayan Hari

Numerade Educator

Problem 138

Study the following table:
Which two compounds have least weight of oxygen?
(a) 1 and 2
(b) 1 and 3
(c) 4 and 4
(d) 3 and 4

Muhammad Ahsan

Numerade Educator

Problem 139

The decomposition of a certain mass of $\mathrm{CaCO}_{3}$ gave $11.2 \mathrm{dm}^{3}$ of $\mathrm{CO}_{2}$ gas at STP. The mass of KOH required to completely neutralize the gas is
(a) $56 \mathrm{~g}$
(b) $28 \mathrm{~g}$
(c) $42 \mathrm{~g}$
(d) $20 \mathrm{~g}$

Shahina -

Numerade Educator

Problem 140

If 1 mole of $\mathrm{H}_{3} \mathrm{PO}_{4}$ is reacted with 1 mole of $\mathrm{X}(\mathrm{OH})_{2}$ as:
$\mathrm{H}_{3} \mathrm{PO}_{4}+\mathrm{X}(\mathrm{OH})_{2} \longrightarrow \mathrm{XHPO}_{4}+2 \mathrm{H}_{2} \mathrm{O}$ then
(a) The equivalent weight of $\mathrm{H}_{3} \mathrm{PO}_{4}$ is $\frac{98}{3}$.
(b) The equivalent weight of base is $\frac{\text { Molecular mass }}{2}$
(c) 1 mole of $\mathrm{X}(\mathrm{OH})_{2}$ more is required for complete neutralization of $\mathrm{XHPO}_{4}$.
(d) The resulting solution required 1 mole $\mathrm{NaOH}$ for complete neutralization.

Shahina -

Numerade Educator

Problem 141

Which of the following contain the same number of molecules ?
(a) $0.1$ mole of $\mathrm{CO}_{2}$
(b) $3.2 \mathrm{~g}$ of $\mathrm{O}_{2}$
(c) $0.1 \mathrm{~g}$ atom of Helium gas
(d) $11.2 \mathrm{~L}$ of $\mathrm{SO}_{2}$ at S.T.P

Narayan Hari

Numerade Educator

Problem 142

2 moles of $\mathrm{CO}_{2}$ is required to prepare:
(a) $168 \mathrm{~g}$ of $\mathrm{NaHCO}_{3}$
(b) $148 \mathrm{gm} \mathrm{Li}_{2} \mathrm{CO}_{3}$
(c) $162 \mathrm{~g}$ of $\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}$
(d) $462 \mathrm{~g}$ of $\mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2}$

Shahina -

Numerade Educator

Problem 143

$\mathrm{H}_{2} \mathrm{C}_{2} \mathrm{O}_{4} \cdot 2 \mathrm{H}_{2} \mathrm{O}$ solution have same
(a) molarity
(b) molality
(c) normality
(d) mole fraction

Narayan Hari

Numerade Educator

Problem 144

$0.1$ mole of $\mathrm{MnO}_{4}^{-}$in acidic medium can oxidize
(a) $0.60$ mole of $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$
(b) $0.25$ mole of $\mathrm{C}_{2} \mathrm{O}_{4}^{2-}$
(c) $0.167$ mole of $\mathrm{FeC}_{2} \mathrm{O}_{4}$
(d) $0.5$ mole of $\mathrm{Fe}^{+2}$

Narayan Hari

Numerade Educator

Problem 145

Which of the following statements are true?
(a) $392 \mathrm{~g}$ of ferrous ammonium sulphate is required to reduce $31.6 \mathrm{~g} \mathrm{KMnO}_{4}$ in aqueous acidic medium.
(b) Molality of a solution does not vary with temperature.
(c) $\mathrm{KBrO}_{3}$ can quantitatively convert $\mathrm{Br}^{-}$to $\mathrm{Br}_{2}$.
(d) The oxidation state of $\mathrm{S}$ in $\mathrm{CNS}$ - is zero.

Md Mohibullah

Auburn University Main Campus

Problem 146

Which of the following statement is/are correct?
(a) $\mathrm{CrI}_{3}+\mathrm{KOH}+\mathrm{Cl}_{2} \rightarrow \mathrm{K}_{2} \mathrm{CrO}_{4}+\mathrm{KCl}+\mathrm{KIO}_{4}+\mathrm{H}_{2} \mathrm{O}$
So, in balanced chemical reaction coefficient of $\mathrm{KOH}$ is 64 .
(b) If $\mathrm{Zn}+\mathrm{KMnO}_{4}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow \mathrm{ZnSO}_{4}+\mathrm{K}_{2} \mathrm{SO}_{4}+$
$\mathrm{MnSO}_{4}+\mathrm{H}_{2}$; then equivalents of $\mathrm{Zn}=$ equivalents of $\mathrm{Zn}=$ equivalents of $\mathrm{KMnO}_{4}+$ equivalents of $\mathrm{H}_{2} \mathrm{SO}_{4}$
(c) $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \stackrel{\Delta}{\longrightarrow} \mathrm{N}_{2}+\mathrm{Cr}_{2} \mathrm{O}_{3}+\mathrm{H}_{2} \mathrm{O}, \mathrm{n}$-factor
of $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ is 12 .
(d) $\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-} \rightarrow \mathrm{Fe}^{3+}+\mathrm{CO}_{2}+\mathrm{NO}_{3}^{-}, \mathrm{n}$-factor for
$[\mathrm{Fe}(\mathrm{CN})]^{3-}$ is 60 .

Narayan Hari

Numerade Educator

Problem 147

The strength of "20 volume" $\mathrm{H}_{2} \mathrm{O}_{2}$ is equal to
(a) $3.58 \mathrm{~N}$
(b) $3.035 \%$
(c) $60.86 \mathrm{~g} / \mathrm{L}$
(d) $1.79 \mathrm{M}$

Vishal Sharma

Numerade Educator

Problem 148

$100 \mathrm{ml}$ of $0.06 \mathrm{M} \mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}$ is added to $50 \mathrm{~mL}$ of $0.06$ $\mathrm{M} \mathrm{Na}_{2} \mathrm{C}_{2} \mathrm{O}_{4}$. After the reaction is complete
(a) $0.003 \mathrm{M}$ of excess of $\mathrm{Ca}^{2+}$ will remain in excess.
(b) $0.003$ moles of calcium oxalate will get precipitated
(c) $\mathrm{Ca}\left(\mathrm{NO}_{3}\right)_{2}$ is excess reagent.
(d) $\mathrm{Na}_{2} \mathrm{C}_{2} \mathrm{O}_{4}$ is limiting reagent.

Muhammad Ahsan

Numerade Educator

Problem 149

Which of the following contains same number of molecules ?
(a) $3.2 \mathrm{~g}$ of $\mathrm{O}_{2}$
(b) $0.1$ mole of $\mathrm{NO}_{2}$
(c) $0.1 \mathrm{~g}$ atom of Ar gas
(d) $11.2 \mathrm{~L}$ of $\mathrm{CO}_{2}$ at S.T.P.

Narayan Hari

Numerade Educator

Problem 150

Oleum is considered as a solution of $\mathrm{SO}_{3}$ in $\mathrm{H}_{2} \mathrm{SO}_{4}$, which is obtained by passing $\mathrm{SO}_{3}$ in concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$. When $100 \mathrm{~g}$ sample of oleum is diluted with desired weight of $\mathrm{H}_{2} \mathrm{O}$, then the total mass of $\mathrm{H}_{2} \mathrm{SO}_{4}$ obtained after dilution is known as \% labeling in oleum. For example, an oleum labeled as '109\% $\mathrm{H}_{2} \mathrm{SO}_{4}$, means the $109 \mathrm{~g}$ total mass of pure $\mathrm{H}_{2} \mathrm{SO}_{4}$ will be formed when $100 \mathrm{~g}$ of oleum is diluted by $9 \mathrm{~g}$ of $\mathrm{H}_{2} \mathrm{O}$ which combines with all the free $\mathrm{SO}_{3}$ present in oleum to form $\mathrm{H}_{2} \mathrm{SO}_{4}$ as $\mathrm{SO}_{3}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{H}_{2} \mathrm{SO}_{4}$.
What is the $\%$ of free $\mathrm{SO}_{3}$ is an oleum that is labeled as $104.5 \% \mathrm{H}_{2} \mathrm{SO}_{4}^{\prime} ?$
(a) 30
(b) 10
(c) 20
(d) 40

Narayan Hari

Numerade Educator

Problem 151

Oleum is considered as a solution of $\mathrm{SO}_{3}$ in $\mathrm{H}_{2} \mathrm{SO}_{4}$, which is obtained by passing $\mathrm{SO}_{3}$ in concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$. When $100 \mathrm{~g}$ sample of oleum is diluted with desired weight of $\mathrm{H}_{2} \mathrm{O}$, then the total mass of $\mathrm{H}_{2} \mathrm{SO}_{4}$ obtained after dilution is known as \% labeling in oleum. For example, an oleum labeled as '109\% $\mathrm{H}_{2} \mathrm{SO}_{4}$, means the $109 \mathrm{~g}$ total mass of pure $\mathrm{H}_{2} \mathrm{SO}_{4}$ will be formed when $100 \mathrm{~g}$ of oleum is diluted by $9 \mathrm{~g}$ of $\mathrm{H}_{2} \mathrm{O}$ which combines with all the free $\mathrm{SO}_{3}$ present in oleum to form $\mathrm{H}_{2} \mathrm{SO}_{4}$ as $\mathrm{SO}_{3}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{H}_{2} \mathrm{SO}_{4}$.
$.9 .0 \mathrm{~g}$ water is added into oleum sample labeled as $" 112 \% " \mathrm{H}_{2} \mathrm{SO}_{4}$ then the volume of free $\mathrm{SO}_{3}$ remaining in the solution atl atm pressure and $0^{\circ} \mathrm{C}$ is
(a) $7.46 \mathrm{~L}$
(b) $3.73 \mathrm{~L}$
(c) $11.2 \mathrm{~L}$
(d) $7.34 \mathrm{~L}$

Narayan Hari

Numerade Educator

Problem 152

Oleum is considered as a solution of $\mathrm{SO}_{3}$ in $\mathrm{H}_{2} \mathrm{SO}_{4}$, which is obtained by passing $\mathrm{SO}_{3}$ in concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$. When $100 \mathrm{~g}$ sample of oleum is diluted with desired weight of $\mathrm{H}_{2} \mathrm{O}$, then the total mass of $\mathrm{H}_{2} \mathrm{SO}_{4}$ obtained after dilution is known as \% labeling in oleum. For example, an oleum labeled as '109\% $\mathrm{H}_{2} \mathrm{SO}_{4}$, means the $109 \mathrm{~g}$ total mass of pure $\mathrm{H}_{2} \mathrm{SO}_{4}$ will be formed when $100 \mathrm{~g}$ of oleum is diluted by $9 \mathrm{~g}$ of $\mathrm{H}_{2} \mathrm{O}$ which combines with all the free $\mathrm{SO}_{3}$ present in oleum to form $\mathrm{H}_{2} \mathrm{SO}_{4}$ as $\mathrm{SO}_{3}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{H}_{2} \mathrm{SO}_{4}$.
$1 \mathrm{~g}$ of oleum sample is diluted with water. The solution required $54 \mathrm{~mL}$ of $0.4 \mathrm{~N} \mathrm{NaOH}$ for complete neutralization. The $\%$ of free $\mathrm{SO}_{3}$ in the sample is
(a) 20
(b) 52
(c) 26
(d) none of these

Narayan Hari

Numerade Educator

Problem 153

Match the following
Column-I
(a) $\underline{\mathrm{P}_{2} \mathrm{H}_{4}} \rightarrow \mathrm{PH}_{3}+\mathrm{P}_{4} \mathrm{H}_{2}$
(b) $\underline{\mathrm{I}_{2}} \rightarrow \mathrm{I}^{-}+\mathrm{IO}_{3}^{-}$
(c) $\mathrm{MnO}_{4}^{-}+\mathrm{Mn}^{+2}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{Mn}_{3} \mathrm{O}_{4}+\mathrm{H}^{+}$
(d) $\underline{\mathrm{H}_{3} \mathrm{PO}_{2}} \rightarrow \mathrm{PH}_{3}+\mathrm{H}_{3} \mathrm{PO}_{3}$
Column-II
(Eq. Wt. of underlined species)
p. $\mathrm{E}=\frac{3 \mathrm{M}}{4}$
q. $E=\frac{3 M}{5}$
r. $\mathrm{E}=\frac{15 \mathrm{M}}{26}$
s. $\mathrm{E}=\frac{5 \mathrm{M}}{6}$

Himanshu Kushwaha

Himanshu Kushwaha

Numerade Educator

Problem 154

Match the following

Muhammad Ahsan

Numerade Educator

Problem 155

Consider the reaction of $\mathrm{Br}_{2}$ with $\mathrm{KOH}$ as shown below and match the following:
$\mathrm{Br}_{2}+\mathrm{KOH} \rightarrow \mathrm{KBr}+\mathrm{KBrO}_{3}+\mathrm{H}_{2} \mathrm{O}$

Muhammad Ahsan

Numerade Educator

Problem 156

The value of $\mathrm{n}$ (the number of electrons) in the half equation in which $\mathrm{Cr}(\mathrm{OH})_{4}^{-}$is oxidized to chromate ion in alkali medium is ___ .

Narayan Hari

Numerade Educator

Problem 157

On heating $1.763 \mathrm{~g}$ of hydrated $\mathrm{BaCl}_{2}$ to dryness, $1.505 \mathrm{~g}$ of anhydrous salt remained. Number of moles of $\mathrm{H}_{2} \mathrm{O}$ present in one mole of the hydrated $\mathrm{BaCl}_{2}$ is ___.

Narayan Hari

Numerade Educator

Problem 158

Equivalent weight of a metal is $4.5$ and the molecular weight of the chloride is $80 .$ The valency of the metal is ___ .

Shahina -

Numerade Educator

Problem 159

$14.96 \mathrm{~g}$ of a mixture containing $\mathrm{n}$-hexane and ethyl alcohol are reacted with sodium metal to give $200 \mathrm{ml}$ of $\mathrm{H}_{2}$ at $27{ }^{\circ} \mathrm{C}$ and $760 \mathrm{~mm}$ pressure. The percentage of ethyl alcohol in the mixture is _____ .

Muhammad Ahsan

Numerade Educator

Problem 160

Consider the reaction, $3 \mathrm{Br}_{2}+6 \mathrm{NaOH} \longrightarrow 5 \mathrm{NaBr}+$
$\mathrm{NaBrO}_{3}+3 \mathrm{H}_{2} \mathrm{O} .$ If $\mathrm{E}$ and $\mathrm{A}$ represent equivalent weight and atomic weight of bromine, then $5 \mathrm{E}=\mathrm{x} \mathrm{A}$. The value of $x$ is ____ .

Narayan Hari

Numerade Educator

Problem 161

Find the number of moles of $\mathrm{KCl}$ in $1000 \mathrm{~mL}$ of $3 \mathrm{M}$ solution

Shahina -

Numerade Educator

Problem 162

$1 \mathrm{~g}$ of an acid $\mathrm{C}_{6} \mathrm{H}_{10} \mathrm{O}_{4}$ required $0.768 \mathrm{~g}$ of $\mathrm{KOH}$ for complete neutralization. Determine the basicity of acid.

Narayan Hari

Numerade Educator

Problem 163

When the equation $\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{H}^{+}+\mathrm{I}^{-} \longrightarrow \mathrm{Cr}^{3+}+\mathrm{I}_{2}$ Is balanced, give the correct coefficient for $\mathrm{I}^{-}$(aq)

Shahina -

Numerade Educator

Problem 164

How many of the following depends upon temperature? Concentration, Normality, molarity, formality molality, mol fraction, \% by mass, \%by strength

Shahina -

Numerade Educator

Problem 165

Number of atoms in $560 \mathrm{~g}$ of $\mathrm{Fe}$ (atomic mass $56 \mathrm{~g}$ $\left.\mathrm{mol}^{-1}\right)$ is
(a) is twice that of $70 \mathrm{~g} \mathrm{~N}$
(b) is half that of $20 \mathrm{~g} \mathrm{H}$
(c) both are correct
(d) none is correct

Shahina -

Numerade Educator

Problem 166

What volume of hydrogen gas, at $273 \mathrm{~K}$ and 1 atm pressure will be consumed in obtaining $21.6 \mathrm{~g}$ of elemental boron (atomic mass $=10.8$ ) from the reduction of boron trichloride by hydrogen? [2003]
(a) $89.6 \mathrm{~L}$
(b) $67.2 \mathrm{~L}$
(c) $44.8 \mathrm{~L}$
(d) $22.4 \mathrm{~L}$

Shahina -

Numerade Educator

Problem 167

$25 \mathrm{~mL}$ of a solution of barium hydroxide on titration with $0.1$ molar solution of hydrochloric acid gave a titre value of $35 \mathrm{~mL}$. The molarity of barium hydroxide solution was
(a) $0.07$
(b) $0.14$
(c) $0.28$
(d) $0.35$

Shahina -

Numerade Educator

Problem 168

To neutralize completely $20 \mathrm{~mL}$ of $0.1 \mathrm{M}$ aqueous solution of phosphorus acid, the volume of $0.1 \mathrm{M}$ aqueous KOH solution required is [2004]
(a) $10 \mathrm{~mL}$
(b) $40 \mathrm{~mL}$
(c) $60 \mathrm{~mL}$
(d) $80 \mathrm{~mL}$

Shahina -

Numerade Educator

Problem 169

$6.02 \times 10^{20}$ molecules of urea are present in $100 \mathrm{~mL}$ of its solution. The concentration of urea solution is
(a) $0.02 \mathrm{M}$
(b) $0.001 \mathrm{M}$
(c) $0.01 \mathrm{M}$
(d) $0.1 \mathrm{M}$

Shahina -

Numerade Educator

Problem 170

If we consider that $\frac{1}{6}$, in place of $\frac{1}{12}$, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will
(a) decrease twice
(b) increase two fold
(c) remain unchanged
(d) be a function of the molecular mass of the substance

Shahina -

Numerade Educator

Problem 171

How many moles of magnesium phosphate, $\mathrm{Mg}_{3}$ $\left(\mathrm{PO}_{4}\right)_{2}$ will contain $0.25$ mole of oxygen atoms?
(a) $0.02$
(b) $3.125 \times 10^{-2}$
(c) $1.25 \times 10^{-2}$
(d) $2.5 \times 10^{-2}$

Shahina -

Numerade Educator

Problem 172

Density of a $2.05 \mathrm{M}$ solution of acetic acid in water is $1.02 \mathrm{~g} / \mathrm{mL}$. The molality of the solution is
(a) $1.14 \mathrm{~mol} \mathrm{~kg}^{-1}$
(b) $3.28 \mathrm{~mol} \mathrm{~kg}^{-1}$
(c) $2.28 \mathrm{~mol} \mathrm{~kg}^{-1}$
(d) $0.44 \mathrm{~mol} \mathrm{~kg}^{-1}$

Shahina -

Numerade Educator

Problem 173

The reaction, $2 \mathrm{Al}(\mathrm{s})+6 \mathrm{HCl}(\mathrm{aq}) \longrightarrow 2 \mathrm{Al}^{3+}(\mathrm{aq})$
$$
\begin{array}{r}
+6 \mathrm{Cl}^{-}(\mathrm{aq})+3 \mathrm{H}_{2}(\mathrm{~g}) \\
\quad[\mathbf{2 0 0 7}]
\end{array}
$$
(a) $33.6 \mathrm{~L} \mathrm{H}_{2}(\mathrm{~g})$ is produced regardless of temperature and pressure for every mole of $\mathrm{Al}$ that reacts
(b) $67.2 \mathrm{~L} \mathrm{H}_{2}(\mathrm{~g})$ at STP is produced for every mole of Al that reacts
(c) $11.2 \mathrm{~L} \mathrm{H}_{2}(\mathrm{~g})$ at STP is produced for every mole of HCl (aq) consumed
(d) $6 \mathrm{~L} \mathrm{HCl}$ (aq) is consumed for every $3 \mathrm{~L} \mathrm{H}_{2}(\mathrm{~g})$
produced

Shahina -

Numerade Educator

Problem 174

The density (in $\mathrm{g} \mathrm{mL}^{-1}$ ) of a $3.60 \mathrm{M}$ sulphuric acid solution, that is, $29 \% \mathrm{H}_{2} \mathrm{SO}_{4}$ (molar mass $=98 \mathrm{~g}$. $\mathrm{mol}^{-1}$ ) by mass will be
(a) $1.88$
(b) $1.22$
(c) $1.45$
(d) $1.64$

Shahina -

Numerade Educator

Problem 175

A $5.2$ molal aqueous solution of methyl alcohol, $\mathrm{CH}_{3} \mathrm{OH}$, is supplied. What is the mole fraction of methyl alcohol in the solution?
(a) $0.86$
(b) $0.086$
(c) $0.043$
(d) $1.0$

Shahina -

Numerade Educator

Problem 176

The density of a solution prepared by dissolving $120 \mathrm{~g}$ of urea (mol. Mass $=60 \mathrm{u}$ ) in $1000 \mathrm{~g}$ of water is $1.15 \mathrm{~g} / \mathrm{mL}$. The molarity of this solutions is: [2012]
(a) $1.02 \mathrm{M}$
(b) $0.50 \mathrm{M}$
(c) $2.05 \mathrm{M}$
(d) $1.78 \mathrm{M}$

Shahina -

Numerade Educator

Problem 177

The molarity of a solution obtained by mixing 750 $\mathrm{mL}$ of $0.5(\mathrm{M}) \mathrm{HCl}$ with $250 \mathrm{~mL}$ of $2(\mathrm{M}) \mathrm{HCl}$ will be
(a) $1.75 \mathrm{M}$
(b) $0.975 \mathrm{M}$
(c) $0.875 \mathrm{M}$
(d) $1.78 \mathrm{M}$

Shahina -

Numerade Educator

Problem 178

The molecular formula of a commercial resin used for exchanging ions in water softening is $\mathrm{C}_{8} \mathrm{H}_{7} \mathrm{SO}_{3} \mathrm{Na}$ (mol. wt. 206). What would be the maximum uptake of $\mathrm{Ca}^{2+}$ ions by the resin when expressed in mole per gram resin?
(a) $\frac{1}{103}$
(b) $\frac{1}{206}$
(c) $\frac{2}{309}$
(d) $\frac{1}{412}$

Shahina -

Numerade Educator