The Pearson Guide to Inorganic Chemistry for the IIT JEE and NEET

Atul Singhal

Chapter 5

Compounds of P-block Elements $-1$ - all with Video Answers

Educators

Chapter Questions

Problem 1

In diborane the two $\mathrm{H} \quad \mathrm{B} \quad \mathrm{H}$ angles are nearly
(a) $60^{\circ}, 120^{\circ}$
(b) $95^{\circ}, 150^{\circ}$
(c) $95^{\circ}, 120^{\circ}$
(d) $120^{\circ}, 180^{\circ}$

Narayan Hari

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Problem 2

Which of rhe following rcacrs wirh $\mathrm{BCl}_{3}$ to form diboranc?
(a) $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$
(b) $\mathrm{Nll}_{3}$
(c) Nal Ig
(d) LiAlI I

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Problem 3

In the reaction
$\mathrm{B}_{2} \mathrm{H}_{6}, 2 \mathrm{KOH} \times 2(\Lambda) \longrightarrow 2(\mathrm{~B}) \times 6 \mathrm{H}_{2}$
(a) and (b) are, respectively
(a) $\mathrm{HCl}, \mathrm{KBO}_{3}$
(b) $11_{2}, 1 \mathrm{I}_{3} \mathrm{BO}_{3}$
(c) $\mathrm{H}_{2} \mathrm{O}, \mathrm{KBO}_{2}$
(d) $11, \mathrm{O}, \mathrm{KBO}_{3}$

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Problem 4

$\mathrm{BCl}_{3}$ does not exist as a dimmer but $\mathrm{BH}_{3}$ exists as $\mathrm{B}_{2} \mathrm{H}_{6}$ because
(a) $C_{2}$ is more electronegative than hydrogen.
(b) large size of the chlorine atom does not fit between the small sized boron atoms, while small sized hydrogen atoms occupy the space between boron atoms.
(c) there is p\pi $=\mathrm{d} \pi$ back bonding in $\mathrm{BCl}_{3}$.
(d) both (b) and (c)

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Problem 5

The structure of diborane $\left(\mathrm{B}_{2} 11_{6}\right)$ conrains
(a) four $2 c-2 \mathrm{c}$ bonds and rwo $3 c-2 \mathrm{c}$ bonds
(b) two $2 c-2 e$ bonds and four $3 c-2 e$ bonds
(c) two $2 c-2 e$ bonds and two $3 c-3 e$ bonds
(d) four $2 c-2 c$ bonds and four $3 c-2 c$ bonds

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Problem 6

In silicon dioxide
(a) there are double bonds between silicon and
oxygen atoms.
(b) silicon is bonded to two silicon atoms.
(c) each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bounded ro two silicon atoms.
(d) each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bounded to two silicon atoms.

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Problem 7

The correct order of acidic nature of oxides is in
the order
(a) $\mathrm{N}_{2} \mathrm{O}_{5}<\mathrm{N}_{2} \mathrm{O}_{3}<\mathrm{NO}_{2}<\mathrm{NO}<\mathrm{N}_{2} \mathrm{O}$
(b) $\mathrm{N}_{2} \mathrm{O}<\mathrm{NO}<\mathrm{N}_{2} \mathrm{O}_{3}<\mathrm{NO}_{2}<\mathrm{N}_{2} \mathrm{O}_{5}$
(c) $\mathrm{N}_{2} \mathrm{O}_{5}<\mathrm{N}_{2} \mathrm{O}<\mathrm{N}_{2} \mathrm{O}_{3}<\mathrm{NO}<\mathrm{N}_{2} \mathrm{O}$
(d) $\mathrm{NO}<\mathrm{N}_{2} \mathrm{O}<\mathrm{N}_{2} \mathrm{O}_{3}<\mathrm{NO}_{2}<\mathrm{N}_{2} \mathrm{O}_{3}$

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Problem 8

$\mathrm{I}_{3} \mathrm{PO}_{3}$ has ... nonionizable P-I I bonds.
(a) 2
(b) 1
(c) None
(d) 5

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Problem 9

Phosphone, acetylene and ammonia can be formed by rearing water with
(a) $\mathrm{M}_{\mathrm{S}_{3}} \mathrm{P}_{2}, \mathrm{Al}_{1} \mathrm{C}_{3}, \mathrm{~L} \mathrm{i}_{3} \mathrm{~N}$
(b) $\mathrm{Ca}_{3} \mathrm{P}_{2}, \mathrm{M}_{\mathrm{S}_{2}} \mathrm{C}, \mathrm{NH}_{4} \mathrm{NO}_{3}$
(c) $\mathrm{Ca}_{3} \mathrm{P}_{2}, \mathrm{CaC}_{2}, \mathrm{CaCN}_{2}$
(d) $\mathrm{Ca}_{2} \mathrm{P}_{2}, \mathrm{CaC}_{2}, \mathrm{Mg}, \mathrm{N}_{2}$

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Problem 10

$\mathrm{SiO}_{2}$ is reacted with sodium carbonate. Which gas is liberated?
(a) $\mathrm{O}_{2}$
(b) $\mathrm{O}_{3}$
(c) $\mathrm{CO}$
(d) $C O$

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Problem 11

$\mathrm{N} 1 \mathrm{l}_{3}$ is converted ro hydra-zinc generally by reation with which of the following?
(a) $\mathrm{CO}$
(b) $\mathrm{SnCl}_{2}$
(c) $\mathrm{NaOCl}$
(d) $\mathrm{NaOF}$

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Problem 12

Cl P CI bond angles in $\mathrm{PCl}_{3}$ molecule are
(a) $120^{\circ}$ and $90^{\circ}$
(b) $60^{\circ}$ and $90^{\circ}$
(c) $60^{\circ}$ and $120^{\circ}$
(d) $120^{\circ}$ and $30^{\circ}$

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Problem 13

When concentrated $11 \mathrm{NO}_{3}$ decomposes slowly in sunlight. Ir gives
(a) Brown colour
(b) Green colour
(c) Yellow colour
(d) Blue colour

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Problem 14

The number of hydrogen atom(s) attached to phosphorous atom in hypo-phosphorous acid is
(a) zero
(b) two
(c) one
(d) three

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Problem 15

Which of the following compound is used in Dunsten's rest?
(a) Alumina
(b) Boric acid
(c) Potash alum
(d) Borax

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Problem 16

The number of $\mathrm{P}-\mathrm{O}-\mathrm{P}$ and $\mathrm{P}-\mathrm{O}-\mathrm{l} 1 \mathrm{~J}$ bonds present,
respectively in pyrophosphoric acid molecule are
(a) 2,2
(b) 1,8
(c) 1,2
(d) 1,4

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Problem 17

The equivalent mass of phosphoric acid $\left(\mathrm{H}_{3} \mathrm{PO}_{4}\right)$ in the reaction,
$\mathrm{NaOH}_{1} \mathrm{H}_{3} \mathrm{PO}_{4} \longrightarrow \mathrm{NaH}_{2} \mathrm{PO}_{4} ? \mathrm{H}_{2} \mathrm{O}$ is
(a) 98
(b) 89
(c) 12
(d) 58

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Problem 18

Correct order of boiling points of hydrides of nitrogen family is
(a) $\mathrm{N} 11_{3}<\mathrm{P} 11_{3}<\mathrm{Asl} 1_{3}<\mathrm{SbI} \mathrm{I}_{3}$
(b) $\mathrm{PH}_{3}<\Lambda \mathrm{sH}_{3}<\mathrm{NH}_{3}<\mathrm{SbH}_{3}$
(d) $\left.\mathrm{PH}_{3}<\mathrm{N} 11_{3}<\mathrm{Sb}\right] \mathrm{l}_{3}<\mathrm{A}_{\mathrm{S}} \mathrm{l} 1_{3}$

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Problem 19

ammonium compound which on heating does not give $\mathrm{NH}_{3}$ is
(a) $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}$
(b) $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}$
(c) $\mathrm{N} 1 \mathrm{l}_{5} \mathrm{NO}$
(d) NI I $C 1$

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Problem 20

Which of rhe following oxides of nitrogen is a colored gas?
(a) $\mathrm{N}_{2} \mathrm{O}$
(b) NO
(c) $\mathrm{N}_{2} \mathrm{O}_{4}$
(d) $\mathrm{NO}_{2}$

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Problem 21

The number of P-O-P bridges in the structure of phosphorous penroxide and phosphorous trioxide are, respectively
(a) 5,5
(b) 5,6
(c) $6.5$
(d) $6.6$

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Problem 22

addition of concentrated HNO $_{3}$ to concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ gives
(a) $\mathrm{SO}_{4}^{2-}$
(b) $\mathrm{SO}_{3}$
(c) NO.
(d) NO.

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Problem 23

$\mathrm{I} \mathrm{I}_{3} \mathrm{PO}_{2}$ is the molecular formula of an acid of phosphorous. Its name and basicity are, respectively
(a) Hypo-phosphoric acid and two
(b) Hypo-phosphorous acid and onc
(c) hypo-phosphorous acid and rwo
(d) Phosphorous arid and rum

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Problem 24

The strongest base is
(a) $\mathrm{N} 11_{3}$
(b) $\mathrm{PH}_{3}$
(c) AsI I $_{3}$
(d) Sbl $1_{3}$

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Problem 25

Ionisation of boric acid in aqueous medium gives which one of the following?
(a) $\left[\mathrm{BO}_{3}\right]^{-}$
(b) $\left[\mathrm{B}(\mathrm{OH})_{1}\right]^{-}$
(c) $\left[\mathrm{B}(\mathrm{OH})_{2} \mathrm{O}\right]^{-}$
(d) $\left[\mathrm{B}(\mathrm{OH}) \mathrm{O}_{2}\right]^{2-}$

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Problem 26

Which of the following halide of carbon is used as refrigerant?
(a) $\mathrm{CCl}_{\text {i }}$
(b) $\mathrm{CF}_{\text {f }}$
(c) $\mathrm{CH}_{2} \mathrm{Cl}_{2}$
(d) $\mathrm{CF}_{2} \mathrm{Cl}_{2}$

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Problem 27

In $\left[\mathrm{B}_{4} \mathrm{O}_{5}(\mathrm{O} 1 \mathbf{1})_{i}\right]^{2}$ anion, what is the number of
B-O-bridges?
(a) 2
(b) 3
(c) 1
(d) 5

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Problem 28

Which of these is most explosive?
(a) $\mathrm{NCl}_{3}$
(b) $\mathrm{PCl}_{3}$
(c) $\mathrm{AsCl}_{3}$
(d) All of thesc

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Problem 29

Two oxides of nitrogen, $\mathrm{NO}$ and $\mathrm{N}\left(\mathrm{)}_{2}\right.$ react together at $253^{\prime \prime} \mathrm{K}$ and form a compound of nitrogen $\mathrm{X} . \mathrm{X}$ reacts with water to yield another compound of nitrogen Y. 'The shape of the anion of $Y$ molecule is
(a) triangular planar
(b) pyramidal
(c) tetrahedral
(d) square planar

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Problem 30

Concentrated HNO, reacts with iodine to give:
(a) $\mathrm{I}$ H
(b) $HO \mathrm{~J}$
(c) $\mathrm{HOIO}_{2}$
(d) $H \mathrm{OIO}_{3}$

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Problem 31

The reaction between $\mathrm{NH}_{2}^{-}$ and $\mathrm{N}_{2} \mathrm{O}$ gives
(a) NO
(b) $\mathrm{N}_{2} \mathrm{O}_{5}$
(c) $\mathrm{N}_{3}$
(d) $\mathrm{N} 11_{2} \mathrm{NH}_{2}$

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Problem 32

The lightening bolts in the atmosphere cause the formation of
(a) $\mathrm{NO}$
(b) $\mathrm{N} 11_{3}$
(c) $\mathrm{NH}_{4} \mathrm{O} 11$
(d) $\mathrm{N} 11 \mathrm{O}_{2} \mathrm{OI} \mathrm{I}$

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Problem 33

Which of the following statement is correct?
(a) $\mathrm{NO}$ is acidic colorless and gascous oxide.
(b) $\mathrm{N}_{2} \mathrm{O}$ is angular in shape.
(c) $\mathrm{NO}_{2}$ is angular in shape with a sweet smell.
(d) NO reacts with NaOI I ro give a mixture of two sales.

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Problem 34

The acid having maximum basicity is
(a) $113 \mathrm{PO}_{3}$
(b) $\mathrm{H}_{3} \mathrm{PO}_{2}$
(c) $11 \mathrm{P}_{2} \mathrm{O}_{5}$
(d) $\mathrm{II}_{3} \mathrm{PO}_{1}$

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Problem 35

Cane sugar reacts with concentrated HNO $_{3}$ to give
(a) Formic acid
(b) Oxalic acid
(c) $C O_{2}$ and water
(d) CO and water

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Problem 36

One mole of magnesium nitride on the reaction with an excess of water gives
(a) two moles of ammonia
(b) two moles of nitric acid
(c) one mole of ammonia
(d) one mole of nitric acid

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Problem 37

The bonds present in $\mathrm{N}_{2} \mathrm{O}_{5}$ arc
(a) only ionic
(b) covalent and coordinate
(c) only covalent
(d) covalent and ionic

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Problem 38

$\mathrm{N}$ forms $\mathrm{NCl}_{3}$ whcrcas $\mathrm{P}$ can form both $\mathrm{PCl}_{3}$ and $\mathrm{PCl}_{5}$. Why?
(a) $\mathrm{N}$ atoms is larger than $\mathrm{P}$ in size.
(b) $\mathrm{P}$ has low lying $3 \mathrm{~d}$ orbitals, which can be used for bonding but $\mathrm{N}$ does not have $3 \mathrm{~d}$ orbitals in its valence shell.
(c) $\mathrm{P}$ is more reactive towards $\mathrm{Cl}$ than $\mathrm{N}$.
(d) None of these.

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Problem 39

A gas thar cannot be collected over water is
(a) $\mathrm{P} \mathrm{I}_{3}$
(b) $\mathrm{O}_{2}$
(c) $\mathrm{SO}_{2}$
(d) $\mathrm{N}_{2}$

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Problem 40

Which of rhe following oxide of nitrogen is most thermally stable?
(a) $\mathrm{N}_{2} \mathrm{O}$
(b) $\mathrm{NO}$
(c) $\mathrm{N}^{2} \mathrm{O}_{3}$
(d) $\mathrm{N}_{2} \mathrm{O}_{5}$

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Problem 41

Nitrogen dioxide cannot be prepared by heating
(a) $\mathrm{KNO}_{3}$
(b) $\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}$
(c) $\mathrm{Cu}\left(\mathrm{NO}_{4}\right)_{2}$
(d) $\mathrm{AgNO}_{2}$

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Problem 42

Number of P P bonds in $\left(\mathrm{HPO}_{3}\right)_{4}$ are
(a) zero
(b) 1
(c) 2
(d) 3

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Problem 43

Moderate electrical conductivity is shown by
(a) diamond
(b) carborundum
(c) graphite
(d) silica

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Problem 44

The formula of calcium cyanamide is
(a) $\mathrm{Ca}(\mathrm{CN})_{2}$
(b) $\mathrm{CaC}, \mathrm{N}$
(c) CaNCN
(d) $\mathrm{CaCHNH}_{2}$

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Problem 45

On the addition of mineral acid to an aqueous solution of borax, the following compound is
(a) Orthoboric acid
(b) Boron hydride
(c) Pyroboric acid
(d) Metaboric acid

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Problem 46

Which of the following compounds are formed when boron trichloride is treated with water
(a) $\mathbf{B}_{2} \mathrm{H}_{6}$ ? $\mathbf{H C l}$
(b) $\mathrm{B}_{2} \mathrm{O}_{3}$ ? HCl
(c) $\mathrm{H}_{3} \mathrm{BO}_{3}$ ? $\mathrm{HCl}$
(d) None of these

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Problem 47

In diborane
(a) All the atoms are in one plane.
(b) Structure is just like ethane.
(c) Presence of B B bond is observed.
(d) Boron atoms are linked together by hydrogen bridges.

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Problem 48

Which statement about nitric acid is not true?
(a) It often has a yellow color due to the formation of $\mathrm{NO}_{2}$.
(b) Its Anhydride is $\mathrm{N}_{2} \mathrm{O}_{3}$.
(c) Ir is a strong oxidizing agent
(d) $\mathrm{I} \mathrm{r}$ is one of the more common strong acids and gets essentially $100 \%$ dissociated in water.

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Problem 49

$\mathrm{PCl}_{3}$ reacts with water to form
(a) $11_{3} \mathrm{PO}_{\text {i }}$
(b) $\mathrm{PII}_{3}$
(c) $\mathrm{POCl}_{3}$
(d) $\mathrm{H}_{3} \mathrm{PO}_{3}, \mathrm{HCl}$

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Problem 50

PH I I + NaOF I forms
(a) $\mathrm{N} 1 \mathrm{l}_{3}$
(b) $\mathrm{P}_{4} \mathrm{O}$
(c) $\mathrm{PH}_{3}$
(d) $\mathrm{P}_{4} \mathrm{O}_{10}$

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Problem 51

What is responsible for the brownish colored gas when copper dissolves in nitric acid?
(a) $2 \mathrm{NO}_{2}(g)$
$>N_{2} O_{A}(g)$
(I) $\quad \mathrm{N}_{2} \mathrm{O}(\mathrm{g})+2 \mathrm{I} \mathrm{I}_{2} \mathrm{O}(\mathrm{g})$
(b) $\mathrm{NII}_{5} \mathrm{NO}_{3}$
(c) $2 \mathrm{~N}_{2}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g})$
$=2 \mathrm{NO}(\mathrm{g})$
(d) $2 \mathrm{~N}\left(\mathrm{)}(\mathrm{g}), \mathrm{O}_{2}(\mathrm{~g}) \quad>2 \mathrm{~N} \mathrm{O}_{2}(\mathrm{~g})\right.$

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Problem 52

Which is not an appropriate method of making phosphoric acid?
(a) $\mathrm{P}_{4}(\mathrm{~s}) \times 16 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \longrightarrow$
$$
4 \mathrm{II}_{3} \mathrm{PO}_{4}(\mathrm{aq})+2 \mathrm{I} \mathrm{I}_{2}(\mathrm{~g})
$$
(b) $\mathrm{P}_{4} \mathrm{O}_{10}(\mathrm{~s})+611_{2} \mathrm{O}(\mathrm{l}) \longrightarrow-4 \mathrm{ll}_{3} \mathrm{PO}_{4}(\mathrm{aq})$
(c) $\mathrm{P} 11_{3}(\mathrm{~g})+2 \mathrm{O}_{2}(\mathrm{~g}) \longrightarrow-11_{3} \mathrm{PO}_{4}(\mathrm{I})$
(d) $\mathrm{PCl}_{,}(\mathrm{s}), 1 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \longrightarrow$
$$
11_{3} \mathrm{PO}_{4}(\mathrm{aq})+5 \mathrm{HCl}(\mathrm{aq})
$$

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Problem 53

$\mathrm{PCl}_{3}$ and $\mathrm{PCl}_{5}$ both exists; $\mathrm{NC} \mathrm{I}_{3}$ exists but $\mathrm{NCl}_{5}$
does not exist. It is due to
(a) lower electronegativity of $\mathrm{P}$ than $\mathrm{N}$.
(b) lower tendency of $\mathrm{N}$ to form covalent bond.
(c) availability of vacant d-orbital in $\mathrm{P}$ bur nor in N.
(d) statement is itself incorrect.

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Problem 54

Identify the oxide of nitrogen in the following reactions. $\mathrm{I} \longrightarrow+3 \mathrm{SnCl}_{2}+61 \mathrm{Cl} \quad>3 \mathrm{SnCl}_{i}$
$+2 \mathrm{NII}_{j} \mathrm{OI}$
II $4 \mathrm{AgNO}_{3}+2 \mathrm{Cl}_{2} \quad>4 \mathrm{AgCl}+\ldots+\mathrm{O}_{2}$
(a) $\mathrm{NO}_{2}, \mathrm{~N}_{2} \mathrm{O}_{5}$
(b) $\mathrm{NO}, \mathrm{N}_{2} \mathrm{O}_{3}$

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Problem 55

$\mathrm{I} \mathrm{INO}_{2}+\mathrm{H}_{2} \mathrm{SO}_{3}+\mathrm{II}_{2} \mathrm{O} \quad>\mathrm{II}_{2} \mathrm{SO}_{4}+[\mathrm{A}] . \mathrm{A}$ is
(a) $\mathrm{N} 1 \mathrm{l}_{3}$
(b) $\mathrm{N}_{2}$
(c) $\mathrm{NH}_{2} \mathrm{OH}$
(d) $\mathrm{NH}_{4} \mathrm{OH}$

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Problem 56

Which is correct statement?
(a) 'The decreasing order of melting point is $\mathrm{NH}_{3}>\left(\mathrm{Cll}_{3}\right)_{2} \mathrm{~N} 1 \mathbf{1}>\mathrm{CI}_{3} \mathrm{~N} 1 \mathrm{l}_{2}>\left(\mathrm{Cll}_{3}\right)_{3} \mathrm{~N}$
(b) The decreasing order of bond angle is $\mathrm{BF}_{3}>\mathrm{PF}_{3}>\mathrm{ClF}_{3}$
(c) Ihe decreasing order of bond dissociation energy is $C .1,>B r_{2}>F_{2}>I_{2}$
(d) $\mathrm{Both}(\mathrm{b})$ and $(\mathrm{c})$.

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Problem 57

Whire phosphorous on reaction with lime water gives calcium salt of an acid (P) along with a gas
(Q). Which of the following is correct?
(a) $(Q)$ is more basic than ammonia.
(b) (P) is dibasic acid
(c) 'The bond angle in (Q) is less than that in case of ammonia.
(d) ( $\mathrm{P}$ ) on heating gives (Q) and $\mathrm{O}_{2}$.

Narayan Hari

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Problem 58

Which of the following is correct?
(a) $\mathrm{P}-\mathrm{O}$ bonds in $\mathrm{P}_{1} \mathrm{O}_{6}$ molecule arc 6 .
(b) $\mathrm{P}-\mathrm{P}$ bonds in $\mathrm{P}_{i}$ molecule arc $6 .$
(c) $\mathrm{P} \mathrm{O} \quad \mathrm{P}$ bonds in $\mathrm{P}_{4} \mathrm{O}_{8}$ molecule are 8 .
(d) Both (a) and $(c)$.

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Problem 59

A colorless poisonous gas (A) which burns with blue flame is passed through aqueous NaOr I ar high pressure and temperature to give $A$ compound $(\mathrm{B}) .(\mathrm{B})$ on hearing gives $(\mathrm{C})$ and $(\mathrm{C})$ gives whire procipirate $(\mathrm{D})$ wirh $\mathrm{CaCl}_{2} .$ Borh $(\mathrm{C})$ and (D) decolourize acidified $\mathrm{KMnO}_{\text {f }}$. lerc (A) can be
(a) CO
(b) $\mathrm{CO}_{2}$
(c) $\mathrm{SC}_{2}$
(d) $\mathrm{H}_{2} \mathrm{~S}$

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Problem 60

If $\mathrm{O}_{2}$ is removed from the formula of anhydride of $\mathrm{HNO}_{2}$ then the formula of the resulting compound satisfies which of the following properties
(a) Ir supports combustion.
(b) It cannot react with red hot copper.
(c) It produces tears in eyes.
(d) It is paramagncric.

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Numerade Educator

Problem 61

The correct increasing order of acidity is
(a) $\mathrm{H}_{2} \mathrm{O}_{3}>\mathrm{CO}_{2}>\mathrm{H}_{2} \mathrm{O}$
(b) $11,0<11_{2} \mathrm{O}_{2}>\mathrm{CO}_{2}$
(c) $\mathrm{H}_{2} \mathrm{O}<\mathrm{H}_{2} \mathrm{O}_{2}<\mathrm{CO}_{2}$
(d) $\mathrm{CO}_{2}>\mathrm{H}_{2} \mathrm{O}_{2}>11_{2} \mathrm{O}$

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Problem 62

When a mixture of $\mathrm{NO}$ and $\mathrm{NO}_{2}$ is passed through an aqueous solution of ammonium sulphate, we get
(a) a dibasic acid whose dinegative anion has all bonds equal with bond angle $90^{\circ}$.
(b) a dibasic acid whose anhydride in solid state form a cyclic trimer which contain three $\Lambda \Lambda$ bonds.
(c) a diatomic gas which on reaction with acetylene under electric spark gives a mono basic acid whose anion is pseudohalide.
(d) a dibasic acid which has nor dehydrating property.

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Problem 63

Nitrogen is liberated by rhe thermal decomposition of only
(a) $\mathrm{NII}_{.1} \mathrm{NO}_{2}$
(b) $\mathrm{NaN}_{3}$
(c) $\left(\mathrm{N} 11_{i}\right), \mathrm{Cr}, \mathrm{O}_{2}$
(d) All of the above

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Problem 64

$11_{3} \mathrm{PO}_{4}$ will be obtained in
(a) Red phosphorous ? conc. $\mathrm{HNO}_{3} \longrightarrow$
(b) White phosphorous + conc. $\mathrm{II}_{2} \mathrm{SO}_{1}$
(c) $\mathrm{PCl}_{3}$ ? oxalic acid followed by heat
(d) $\Lambda \mathrm{ll}$ of these

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Numerade Educator

Problem 65

$\mathrm{P}_{4} \mathrm{O}_{10}$ on reaction with $\mathrm{PCl}$, gives
(a) $\mathrm{POCl}_{3}$ and $\mathrm{O}_{2}$
(b) $\mathrm{POCl}_{3}$ only
(c) $\mathrm{PO}_{2} \mathrm{Cl}$ only
(d) $\mathrm{POCl}_{3}$ and $\mathrm{Cl}_{2}$

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Problem 66

$\mathrm{H}_{2} \mathrm{C}_{2} \mathrm{O}_{4} \longrightarrow \Delta-\operatorname{Gas}(\mathrm{P})$ ? gas (Q) ? liquid
(R) Gas (P) burns with a blue flame and is oxidized to gas (Q) $\mathrm{C}_{\mathrm{sas}}(\mathrm{P}), \mathrm{Cl}_{2} \longrightarrow(\mathrm{S}) \stackrel{\mathrm{NI} \mathrm{T}_{\ddot{3}}, \Lambda}{\longrightarrow}(\mathrm{l})$
$(\mathbf{P}),(\mathrm{Q}),(\mathrm{R})$ and $(\mathrm{T})$ arc, rcspcerively
(a) $C O, C O_{2}, C O C l_{2}, H C O N H_{2}$
(b) $\mathrm{CO}, \mathrm{CO}_{2}, \mathrm{H}_{2} \mathrm{O}, \mathrm{COCl}_{2}$
(c) $\mathrm{CO}_{2}, \mathrm{CO}, \mathrm{H}_{2} \mathrm{O}, \mathrm{I} \mathrm{ICONII}_{2}$
(d) $\mathrm{CO}, \mathrm{CO}_{2}, \mathrm{H}_{2} \mathrm{O}, \mathrm{NH}_{2} \mathrm{CONH}_{2}$

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Numerade Educator

Problem 67

During the preparation of $\mathrm{N}_{2} \mathrm{O}$ by heating a mixture of $\mathrm{NaNO}_{3}$ and $\left(\mathrm{N} 11_{i}\right)_{2} \mathrm{SO}_{1}$, which of the following is correct?
(a) The evolved gas is passed through $\mathrm{FeSO}_{1}$ solution to remove nitric oxide.
(b) The evolved gas is collected over cold water as it is fairly soluble in hot
water.
(c) Both are correct.
(d) None is correct.

Narayan Hari

Numerade Educator

Problem 68

What may be expected to happen if phosphine gas is mixed with chlorine gas?
(a) $\mathrm{PCl}_{5}$ and $\mathrm{HCl}$ are formed and the mixture cools down.
(b) $\mathrm{PH}_{3} \cdot \mathrm{Cl}_{2}$ is formed with warming up.
(c) $\mathrm{PCl}_{3}$ and $\mathrm{F} \mathrm{Cl}$ are formed and the mixture warms up
(d) The mixture only cools down

Narayan Hari

Numerade Educator

Problem 69

Amongst the trihalides of nitrogen, which one is least basic?
(a) $\mathrm{NT}_{3}$
(b) $\mathrm{NCl}_{3}$
(c) $\mathrm{NBr}_{3}$
(d) $\mathrm{NI}_{3}$

Narayan Hari

Numerade Educator

Problem 70

Hydrolysis of $\mathrm{PI}_{3}$ yields
(a) Monobasic acid and a dibasic acid.
(b) Monobasic acid and a salt.
(c) A monobasic acid and tribasic acid.
(d) A monoacidic base and a dibasic acid.

Narayan Hari

Numerade Educator

Problem 71

$\mathrm{NaOH}$ (aq.) on reaction with $\mathrm{N}_{2} \mathrm{O}_{5}$ gives $(\mathrm{X})$. NaCl (ag.) on reaction with $\mathrm{N}_{2} \mathrm{O}_{5}$ gives $(\mathrm{X})$ and
(Y). (Y) is
(a) $\mathrm{NaNO}_{2}$
(b) $\mathrm{NOCl}$
(c) $\mathrm{NaNO}_{3}$
(d) $\mathrm{NO}_{2} \mathrm{Cl}$

Shahina -

Numerade Educator

Problem 72

Which of the following statements are correct about the reaction between the copper metal and dilure $\mathrm{I} \mathrm{INO}_{3}$ ?
I The principle reducing produce is NO gas.
II Cu metal is oxidized ro $\mathrm{Cu}^{2}$ (aq.) ion which is blue in color.
III NO is paramagnetic and has one unpaired electron in anti bonding molecular orbital.
IV NO reacts with $\mathrm{O}_{2}$ to produce $\mathrm{NO}_{2}$ which is linear in shape. Choose the correct statements.
(a) I and III
(b) I, II and III
(c) II and III
(d) II, III and IV

Narayan Hari

Numerade Educator

Problem 73

$\mathrm{HBr}$ and $\mathrm{HI}$ reduce sulphuric acid, $11 \mathrm{Cl}$ can reduce $\mathrm{KMnO}_{4}$ and $11 \mathrm{~F}$ can reduce
(a) $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$
(b) $\mathrm{KMnO}_{4}$
(c) $\mathrm{H}_{2} \mathrm{SO}_{1}$
(d) None of the above

Narayan Hari

Numerade Educator

Problem 74

When HNO $_{2}$ reacts with conc. $11_{2} \mathrm{SO}_{4}$ two gases (P) and (Q) arc produced. The correct statement is
(a) Bort arc triaromic and colorless.
(b) Both are triatomic and diamagnetic.
(c) Both are odorless.
(d) None of these

Shahina -

Numerade Educator

Problem 75

For $\mathrm{P}_{1}$ ? $\mathrm{Cl}_{2}$ (excess)
$=(\Lambda)^{H_{2} O}>(\mathrm{B}),(C)$
any alkene can react with $(C)$ to give a compound which can perform Wurtz reaction. Here (B) is
(a) HCl
(b) $\mathrm{H}_{3} \mathrm{PO}_{2}$
(c) $11_{3} \mathrm{PO}_{4}$
(d) $11_{3} \mathrm{PO}_{3}$

Narayan Hari

Numerade Educator

Problem 76

Consider the following statements for diborane.
I Boron is approximately sp $^{3}$ hybridized. II $\mathrm{B} \mathrm{H} \mathrm{B}$ angle is $180^{\circ}$
III There arc row terminal B-I I bonds for each boron atom.
IV There are only 12 bonding electrons available.
(a) 1,2 and 3 are correct
(b) 2,3 and 1 are correct
(c) 1,3 and 1 are correct
(d) 1,2 and 4 are correct

Narayan Hari

Numerade Educator

Problem 77

'The lightening bolts in the atmosphere cause the formation of
(a) $\mathrm{NH}_{3}$
(b) NO
(c) $\mathrm{NH}_{2} \mathrm{OH}$
(d) $\mathrm{NH}_{4} \mathrm{OH}$

Narayan Hari

Numerade Educator

Problem 78

The yellow color of conc. HNO, can be removed by
(a) Passing $\mathrm{N} 1 \mathrm{l}_{3}$.
(b) Passing air through warm acid.
(c) adding $\mathrm{Mg}$ powder.
(d) Boiling the acid.

Narayan Hari

Numerade Educator

Problem 79

$\mathrm{P}_{4} \mathrm{O}_{6}$ is heated with water to give
(a) Orthophosphoric acid
(b) Orthophosphorous acid
(c) I Iypophosphorous acid
(d) Hypophorphoric acid

Narayan Hari

Numerade Educator

Problem 80

A certain salt $(\mathrm{X})$ gives the following rests:
On strongly heating it swells to give glassy material. When concentrated $\mathbf{H}_{2} \mathrm{SO}_{4}$ is added to a hot concentrated solution of $(\mathrm{X})$, white crystals of a weak acid separate our. Identify (X)?
(a) $\mathrm{NaBO}_{2}$
(b) $\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{i}$
(c) $\mathrm{Na}_{2} \mathrm{~S}, \mathrm{O}_{3}$
(d) $\mathrm{Ca}_{2} \mathrm{~B}_{6} \mathrm{O}_{11}$

Narayan Hari

Numerade Educator

Problem 81

among the following substituted silanes the one which will give rise to cross-linked silicone polymer on hydrolysis is
(a) $\mathrm{R}_{4} \mathrm{Si}$
(b) $\mathrm{RSiCl}_{3}$
(c) $\mathrm{R}_{2} \mathrm{SiCl}_{2}$
(d) $\mathrm{R}_{3} \mathrm{SiCl}$

Narayan Hari

Numerade Educator

Problem 82

Phosphorous on reaction with conc. $11 \mathrm{NO}_{3}$ gives an acid (A) which can also be formed by the action of dil. $11_{2} \mathrm{SO}_{4}$ on powdered phosphoric rock. The acid $(A)$ is
(a) $\mathrm{H}_{3} \mathrm{PO}_{3}$
(b) $11_{3} \mathrm{PO}_{4}$
(c) $\mathrm{H}_{3} \mathrm{PO}_{2}$
(d) $\mathrm{HPO}_{3}$

Narayan Hari

Numerade Educator

Problem 83

Nirtogen (I) oxicle is produccd by
(a) Thermal decomposition of ammonium nitrate.
(b) Disproportionation of $\mathrm{N}_{2} \mathrm{O}_{1}$.
(c) Thermal decomposition of ammonium nitrite.
(d) Interaction of hydroxyl amine and nitrous acid.

Narayan Hari

Numerade Educator

Problem 84

Which one of the following is/arc the incorrect statements?
(a) Boric acid is a protonic acid
(b) Beryllium exhibits coordination number of six.
(c) Chlorides of borh beryllium and aluminium have bridged chloride structures in solid phase.
(d) $\mathrm{B}_{2} \mathrm{H}_{6}, 2 \mathrm{~N} 1 \mathrm{l}_{3}$ is known as Inorganic Benzene.

Narayan Hari

Numerade Educator

Problem 85

Select the correct statements about diborane
(a) $\mathrm{H}_{\mathrm{b}} \ldots \mathrm{B} \ldots . \mathrm{H}_{\mathrm{b}}$ bond angle is $122^{\circ}$.
(b) All hydrogens in $\mathrm{B}_{2} 11_{6}$ lic in the same planc.
(c) $\mathrm{B}_{2} \mathrm{II}_{6}$ has three centered bond.
(d) Each boron atom lies in sp $^{3}$ hybrid state.

Narayan Hari

Numerade Educator

Problem 86

Which of the following statement is/are correct for $11, \mathrm{BO}_{3} ?$
(a) It has a layer structure in which $\mathrm{BO}_{3}$ units are joined by hydrogen bonds.
(b) It is obtained by treating borax with conc. $\mathrm{H}_{2} \mathrm{SO}_{4}$
(c) Ir is mainly monobasic acid and a Lewis acid.
(d) It does not act as a proton donor bur acts as an acid by accepting hydroxyl ions.

Narayan Hari

Numerade Educator

Problem 87

The incorrect statement/s among the following is/are
(a) NCl does not exist while PCl, does.
(b) Lead prefers to form tetravalent compounds.
(c) The three $C$
0 bonds are not equal in the carbonate ion.
(d) Both $\mathrm{O}_{2}$ and $\mathrm{NO}$ are paramagnetic

Narayan Hari

Numerade Educator

Problem 88

Which of the following statements is/arw correct?
(a) Hypophosphorous acid shows reducing properties
(b) Pyrophosphoric acid has although 4 OH groups bur it is a dibasic acid
(c) Orthophosphorous acid is obtained during disproportionation of hypophosphorous acid
(d) Metaphosphoric acid on heating gives $\mathrm{P}_{4} \mathrm{O}$

Shahina -

Numerade Educator

Problem 89

Which of the following statements) is/are false?
(a) $11_{3} \mathrm{PO}_{3}$ is a stronger acid than $\mathrm{H}_{2} \mathrm{SO}_{3}$.
(b) In aqueous medium $11 \mathrm{~F}$ is a stronger acid than I ICl.
(c) $\mathrm{HNO}_{3}$ is a stronger acid than $\mathrm{HNO}_{2}$.
(d) $\mathrm{HClO}_{4}$ is a weaker acid than $\mathrm{HClO}_{3}$.

Narayan Hari

Numerade Educator

Problem 90

The metals which produce hydrogen only with very dilure nitric acid are
(a) $\mathrm{Mg}$
(b) $\mathrm{Mn}$
(c) $7 \mathrm{n}$
(d) $\mathrm{Fc}$

Narayan Hari

Numerade Educator

Problem 91

Which of the following reactions can evolve phosphine?
(a) $\mathrm{PII}_{4} \mathrm{~J}+\mathrm{NaOll} \longrightarrow$
(b) Whirc $\mathrm{P}+\mathrm{Ca}(\mathrm{O} 11)_{2}$
$>$
(c) $\mathrm{A} \mid \mathrm{P}+11 \mathrm{l}_{2} \mathrm{O}$
(d) $\mathrm{H}_{3} \mathrm{PO}_{4} \stackrel{\text { IIeat }}{\rightarrow}$

Narayan Hari

Numerade Educator

Problem 92

Carbon monoxide cannot be absorbed by
(a) nickel retracarbonyl
(b) plants
(c) an ammonical solution of cuprous chloride
(d) alcohol

Narayan Hari

Numerade Educator

Problem 93

Carbon monoxide is
(a) a reducing agent
(b) neutral to litmus
(c) poisonous in nature
(d) a good oxidizing agent

Narayan Hari

Numerade Educator

Problem 94

$\mathrm{P}$ () $\mathrm{P}$ bond is present in
(a) Tripoly phosphoric acic]
(b) Pyro phosphorous acid
(c) Cyclic trimetaphosphoric acid
(d) Hypo phosphorous acid

Narayan Hari

Numerade Educator

Problem 95

Which of the following is incorrect?
(a) Borax glass is the anhydrous form of borax.
(b) Jeweller's borax is obtained by crystallizing the solution ar $25^{\circ} \mathrm{C}$.
(c) Decahydrate form of borax is obtained by crystallizing the solution ar $60^{\circ} \mathrm{C}$.
(d) Boric acid is less soluble in hot water bur more soluble in cold water.

Shahina -

Numerade Educator

Problem 96

Which of the following is/are correct?
(a) Nitric oxide in solid state exhibits diamagnetic property.
(b) $\mathrm{NH}_{3}$ is a weak reducing agent compared to $\mathrm{PH}_{3}$
(c) Hydrolysis of $\mathrm{NCl}_{3}$ gives $\mathrm{N} 1 \mathrm{l}_{3}$ and $\mathrm{FOCl}$.
(d) $\mathrm{NI} \mathrm{I}_{3}$ is less stable than $\left.\mathrm{P}\right] \mathrm{l}_{3}$.

Shahina -

Numerade Educator

Problem 97

Which of the following is/are incorrect?
(a) $\mathrm{N}_{2} \mathrm{O}$ support combustion but $\mathrm{O}_{2}$ does not support combustion.
(b) $\mathrm{N}_{2} \mathrm{O}$ is coloured while $\mathrm{O}_{2}$ is colorless.
(c) Borh $\mathrm{N}_{2} \mathrm{O}$ and $\mathrm{O}_{2}$ produce brown fumes when reacted with NO.
(d) $\mathrm{O}_{2}$ is supporter of life while $\mathrm{N}_{2} \mathrm{O}$ is poisonous in nature.

Vishal Sharma

Numerade Educator

Problem 98

Which of the following is/are correct here?
(a) Diborane is a colored gas and stable at low temperature.
(b) The member of $\mathrm{B}_{n} 11_{\mathrm{a}+6}$ series are less stable rhan $\mathrm{B}_{\mathrm{n}} \mathrm{I} \mathrm{I}_{\mathrm{a}-4}$.
(c) The reaction of diborane with oxygen is endothermic.
(d) It has banana bonds.

Alkendra Singh

Numerade Educator

Problem 99

Which of the following is incorrect?
(a) A crystalline form of boron nitride called borazon is harder than diamond.
(b) all the B N bonds are equal in borazine.
(c) In borazole the negative charge is carried our by borons.
(d) Borazole is less reactive than benzene.

Shalini Tyagi

Numerade Educator

Problem 100

Choose the correct statements.
(a) The bond in $\mathrm{NO}^{+}$ is stronger than that in $\mathrm{NO}$
(b) Nitric oxide is thermodynamically unstable and at high pressures undergoes disproportionation into $\mathrm{N}_{2} \mathrm{O}$ and $\mathrm{N} \mathrm{O}_{2}$
(c) Dissolving $\mathrm{N}_{2} \mathrm{O}_{3}$ in concentrated H$_{2} \mathrm{SO}_{4}$ yields both nitrosonium and nitronium ions.
(d) Dinitrogen retroxide yields both nitrosonium and nitronium ions wirh conc. I $\mathrm{I}_{2} \mathrm{SO}_{1}$

Alkendra Singh

Numerade Educator

Problem 101

Compound (P) is
(a) $\mathrm{NaOH}$
(b) $\mathrm{NaBO}_{2}$
(c) $\mathrm{Na}_{3} \mathrm{BO}_{3}$
(d) $\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}$

Shahina -

Numerade Educator

Problem 102

Compound (Q) is
(a) $\mathrm{Na}_{3} \mathrm{BO}_{3}$
(b) $\mathrm{NaOH}$
(c) $\mathrm{NaBO}_{2}$
(d) $\mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}$

Shahina -

Numerade Educator

Problem 103

Compound (R) is
(a) $11_{3} \mathrm{BO}_{3}$
(b) $11_{2} \mathrm{~B}_{1} \mathrm{O}_{7}$
(c) $11 \mathrm{~B}_{3} \mathrm{O}_{5}$
(d) $11 \mathrm{BO}_{2}$

Shahina -

Numerade Educator

Problem 104

Compound (S) is
(a) B
(b) $\mathrm{H}_{3} \mathrm{BO}_{3}$
(c) $\mathrm{B}_{2} \mathrm{O}_{3}$
(d) None of these

Shahina -

Numerade Educator

Problem 105

Compound $(T)$ is
(a) $\mathrm{Cu}\left(\mathrm{BO}_{2}\right)_{2}$
(b) CuS
(c) $\mathrm{Cu}_{2} \mathrm{O}$
(d) $\mathrm{CuSO}_{3}$

Shahina -

Numerade Educator

Problem 106

Which is correct about compound $(\mathrm{C})$ ?
(a) An electron deficient compound
(b) An ioric compound
(c) 3 centered 2 electron pair compound
(d) Both (a) and (c)

Shahina -

Numerade Educator

Problem 107

Compounds $(A)$ and $(B) \operatorname{arc}$
(a) $(\mathrm{A})-\mathrm{BO}_{3}$, (b) $-\mathrm{B}_{4} \mathrm{C}$
(b) $(\mathrm{A})-\mathrm{B}_{2} \mathrm{O}_{3},(\mathrm{~b})-\mathrm{BCl}_{3}$
(c) $(\Lambda)=\mathrm{BO}_{2},(\mathrm{~b})=\mathrm{BCl}_{2}$
(d) $(\Lambda)=\mathrm{BO}_{3},(\mathrm{~b})=\mathrm{BCl}_{4}$

Shahina -

Numerade Educator

Problem 108

Compound (E) is
(a) Borazon
(b) Boron nitride
(c) Borazole
(d) Both (a) and (c)

Shahina -

Numerade Educator

Problem 109

Compound (F) is used as a/an
(a) Buffer agent
(b) Oxidizing agent
(c) Reducing agcnc
(d) Complexing agent

Vishal Sharma

Numerade Educator

Problem 110

Here, compound $(\mathrm{P})$ is
(a) Boron chloride
(b) Boror nitride
(c) Boror phosphide
(d) Boror carbide

Vishal Sharma

Numerade Educator

Problem 111

Here, white powder (Q) and gas (R) arc, respectively
(a) Boric acid and phosphine
(b) Boric acid and $\mathrm{CO}_{2}$
(c) Boric acid and ammonia
(d) Boric acid and nitrogen

Vishal Sharma

Numerade Educator

Problem 112

Here, compound (S) and liquid (T) arc
(a) $\mathrm{B}_{2} \mathrm{O}_{3}$ and $\mathrm{B}_{1} \mathrm{C}$
(b) $\mathrm{B}_{2} \mathrm{O}_{3}$ and $\mathrm{BCl}_{3}$
(c) $\mathrm{HBO}_{2}$ arid $\mathrm{BCl}_{3}$
(d) $\mathrm{H}_{4} \mathrm{~B}_{2} \mathrm{O}_{i}$ and $\mathrm{B}_{2} \mathrm{O}_{3}$

Vishal Sharma

Numerade Educator

Problem 113

Here, the compound (V) is
(a) $\mathrm{B}_{2} \mathbf{l l}_{\text {( }}$
(b) $\mathbf{B}_{4} \mathrm{H}_{10}$
(c) $\mathrm{B}_{2} \mathrm{ll}_{5} \mathrm{Cl}$
(d) A mixture of $\mathrm{B}_{2} \mathrm{II}_{6}$ and $\mathrm{B}_{i} \mathbf{1} 1_{10}$

Vishal Sharma

Numerade Educator

Problem 114

Here, $(\mathrm{X})$ is
(a) $\mathrm{P}_{4} \mathrm{O}_{6}$
(b) $\mathrm{P}_{4} \mathrm{O}_{10}$
(c) $\mathrm{SO}_{3}$
(d) $\mathrm{N}_{2} \mathrm{O}_{5}$

Vishal Sharma

Numerade Educator

Problem 115

Here, the compound (Y) is
(a) $11_{3} \mathrm{PO}_{3}$
(b) $\mathrm{I} \mathrm{NO}_{\mathrm{j}}$
(c) $11_{3} \mathrm{PO}_{2}$
(d) $\mathrm{I} 1 \mathrm{PO}_{3}$

Vishal Sharma

Numerade Educator

Problem 116

Which of the following statement is not correct here?
1. Ir $\mathrm{P}_{4} \mathrm{O}_{6}$ and $\mathrm{P}_{4} \mathrm{O}_{10}$ number of sigma bonds are 12 and 11, respectively.
2. HPO $_{3}$ is monobasic:
3. White precipitate is of barium sulphate
1. White precipitate is of $\mathrm{Ba}\left(\mathrm{PO}_{3}\right)_{2}$.
(a) 1 only
(b) $\mathrm{l}$ and 4
(c) $\mathrm{I}$ and 3
(d) 1,3 and 4

Vishal Sharma

Numerade Educator

Problem 117

Among the following, the correct statement is
(a) Phosphates have no biological significance in humans.
(b) Between nitrates and phosphates, phosphates are less abundant in earth's crust.
(c) Between nitrates and phosphates, nitrates are less abundant in earth's crust.
(d) Oxidation of nitrates is possible in soil.

Vishal Sharma

Numerade Educator

Problem 118

Among the following, the correct statement is
(a) Between $\mathrm{N} 1 \mathrm{l}_{3}$ and $\mathrm{PI} \mathrm{l}_{3}, \mathrm{~N} 1 \mathrm{l}_{3}$ is a better
electron donor because the lone pair of electrons occupies spherical 's orbiral and is Iess directional.

Vishal Sharma

Numerade Educator

Problem 119

119. White phosphorus on reaction with $\mathrm{NaOH}$ gives $\mathrm{PH}_{\text {as }}$ as one of the products. This is a
(a) Dimerization reaction
(b) Disproportional reaction
(c) Condensation reaction
(d) Precipitation reaction

Vishal Sharma

Numerade Educator

Problem 120

\mathrm{CF}_{4}$ and $\mathrm{NF}_{3}$ cannot be hydrolyzed.
(R); Carbon and nitrogen both do nor have vacant d-orbiral.

Vishal Sharma

Numerade Educator

Problem 121

(A): $A 1 \mathrm{~F}_{3}$ is an ionic compound whereas $\mathrm{BT}_{3}$ is covalent compound.
(R): $B F_{3}$ involves back $\pi$ bonding.

Vishal Sharma

Numerade Educator

Problem 122

( $\Lambda$ ): $\mathrm{BF}_{3}$ is a weaker Lewis acid than $\mathrm{BCl}_{3}$.
(R): The planar $\mathrm{BF}_{3}$ molecule is stabilized or a greaterr cxtener than $\mathrm{BCl}_{3}$ by $\mathrm{B}-\mathrm{X}$ Ir-bonding.

Vishal Sharma

Numerade Educator

Problem 123

Liquid ammonia is used for refrigeration.
(R): It vaporizes quickly.

Vishal Sharma

Numerade Educator

Problem 124

(A): In $\mathrm{N}_{2} \mathrm{O}_{1}$ as solvent, substance $\mathrm{NOCl}$ which yiclas NO' ions are regarded as acids.
(R): In $\mathrm{N}_{2} \mathrm{O}_{4}$ as solvent substances as $\mathrm{NaNO}_{3}$ which yield $\mathrm{NO}_{3}^{-\text {ions are regarded as bases. }}$

Alkendra Singh

Numerade Educator

Problem 125

(A): Ar orthophosphoric acid is added to the ' Zimmerman Rein hard reagent during dichrometric titration of ferrous salts.
(R): Orrhophosphoric acid reduces the potential of the iron couple, thus aiding the oxidation of a ferrous salt.

Alkendra Singh

Numerade Educator

Problem 126

( $\Lambda$ ): $\mathrm{HNO}_{3}$ is stronger acid than $\mathrm{HN} \mathrm{O}_{2}$.
(R): In HNO $_{3}$ there are two nitrogen and $o x y-$ gen bonds whereas in HNO $_{2}$ there is only one such bond.

Shalini Tyagi

Numerade Educator

Problem 127

(A): A small piece of Zn metal dissolves in dilute $11 \mathrm{NO}_{3}$ but no is hydrogen evolved.
(R): $\mathrm{HNO}_{3}$ is oxidizing acid and this oxidizes the evolved $\mathrm{H}_{2}$ into water.

Vishal Sharma

Numerade Educator

Problem 128

(\Lambda): Silicones are hydrophobic in nature.
(R): Si-O-Si linkages are moisture sensitive

Vishal Sharma

Numerade Educator

Problem 129

(A): On cooling, the brown color of nitrogen dioxide disappears.
(B): On cooling, $\mathrm{NO}_{2}$ undergoes dimerization resulting in the pairing of the odd electron in $\mathrm{NO}_{2}$

Shahina -

Numerade Educator

Problem 130

(a): Both $\mathrm{H}_{3} \mathrm{PO}_{4}$ and $\mathrm{H}_{3} \mathrm{P}\left(\mathrm{J}_{3}\right.$ possess the same number of hydrogen atoms, yet $\mathrm{H}_{3} \mathrm{P}(\}_{4}$ behaves as a tribasic acid while $\mathrm{H}_{3} \mathrm{P}()_{3}$ behave as a dibasic acid.
(R): In I I $_{3} \mathbf{P O}_{4}$ there are three hydrogen atoms linked ro phosphorous through oxygen atoms whereas in I I $_{3} \mathrm{PO}_{3}$ there are only two such hydrogen atoms.

Vishal Sharma

Numerade Educator

Problem 131

( $\Lambda$ ): $\mathrm{PF}_{5}$ and $\mathrm{IF}_{5}$ have similar shapes.
(R): $\mathrm{PF}_{5}$ has two types of $\mathrm{P}-\mathbf{F}$ bond Lengths.

Shahina -

Numerade Educator

Problem 132

(\Lambda): Boric acid behaves as a weak monobasic acid.
(R): Boric acid contains hydrogen bonds in its structure.

Shahina -

Numerade Educator

Problem 133

(A): Between $\mathrm{SiCl}_{\text {, }}$ and $\mathrm{CCl}_{\text {, }}$, only $\mathrm{SiCl}_{\text {, reacts }}$ with water.
(R): SiCl is ionic and CCl is covalent.

Shahina -

Numerade Educator

Problem 134

(A): Although $\mathbf{P} \mathrm{F}_{5}, \mathrm{PCl}_{5}$ and $\mathrm{PBr}_{3}$ are known, the pentahalides of nitrogen have not been observed.
(R): Phosphorous has lower electronegativity Than nitrogen.

Vishal Sharma

Numerade Educator

Problem 135

(A): $\mathrm{PCl}_{5}$ is covalent in gaseous and liquid states but ionic in solid stare.
$(\mathrm{R}): \mathrm{PCl}_{5}$ in solid state consists of tetrahedral PCl $_{4}^{+}$ cation and octahedral $\mathrm{PCL}_{b}^{-}$ anion.

Vishal Sharma

Numerade Educator

Problem 136

$(\Lambda):$ \among nitrogen halides $\mathrm{NX}_{3}$, the dipole moment is highest for $\mathrm{NI}_{3}$ and lowest for $\mathrm{NF}_{3}$.
(R): Nitrogen halides $\mathrm{NX}_{3}$, have trigonal pyramidal structure.

Shahina -

Numerade Educator

Problem 137

(\Lambda): $\mathrm{NO}_{3}$ is planar while $\mathrm{NH}_{3}$ is pyramidal.
$(\mathrm{R}): \mathrm{N}$ in $\mathrm{NO}_{3}^{-}$ is $\mathrm{sp}^{2}$ hybridized but in $\mathrm{NII}_{3}$ ir is $\mathrm{sp}^{3}$ hybridized.

Shahina -

Numerade Educator

Problem 138

( $\Lambda):$ Boron always forms covalent bond.
(R): The small size of $\mathbf{B}^{3 \text { ? favours formarion of }}$
covalent bond.

Shahina -

Numerade Educator

Problem 139

(A): In water, orthoboric acid behaves as a weak monobasic acid.
(R): In water, orthoboric acid acts as a proton donor.

Shahina -

Numerade Educator

Problem 140

Column I (Catalyst $\quad$ Column II (Process) Used in Process)
\Lambda. Platinum
(p) Manufacturing of $\mathrm{NII}_{3}$
B. $\mathrm{V}_{2} \mathrm{O}_{5}$
(q) Hydrogenation
(r) Decomposition of
C. Iron $\quad$ bleaching powder
D. Cobalt chloride
(s) Manufacturing of IINO $_{3}$
(t) Manufacturing of $\mathrm{II}_{2} \mathrm{SO}_{4}$

Vishal Sharma

Numerade Educator

Problem 141

Match the following:
Column I $\quad$ Column II
A. $\mathrm{II}_{3} \mathrm{BO}_{3}$
(p) Monobasic
B. $\mathrm{II}_{3} \mathrm{PO}_{3}$
(q) Dibasic

Vishal Sharma

Numerade Educator

Problem 142

Match the following:
Column I Column II
A. $\operatorname{Borax}^{\Delta} \Delta$
(p) $\mathrm{NaBO}_{2}+\mathrm{B}_{2} \mathrm{O}_{3}$
3. $\mathrm{B}_{2} \mathrm{H}_{6}{ }^{1} \mathrm{H}_{2} \mathrm{O}$
(q) $\mathrm{H}_{3} \mathrm{BO}_{3}$
C. $\mathrm{B}_{2} \mathrm{II}_{6}+\mathrm{NII}_{3}$ (cxcess) $\Delta$.
(r) $\mathrm{BN}$
D. $\left.\mathrm{BCl}_{3} \cdot \mathrm{LiA}\right] \mathrm{H}_{\text {i }}$
(s) $\mathrm{B}_{2} \mathrm{H}_{6}$

Vishal Sharma

Numerade Educator

Problem 143

Match the following:
Column I $\quad$ Column II
A. $\mathrm{BCl}_{3}$
(p) $\mathrm{sp}^{2}$
B. $\mathrm{NCl}_{3}$
(q) $\mathrm{sp}^{3}$
C. PCI $_{3}$
(c) Lewis acid
D. $\mathrm{CCl}_{4}$
(s) Lewis base
(t) Pyramidal in shape

Vishal Sharma

Numerade Educator

Problem 144

Match the following:
Column I Column II
A. $\mathrm{H}_{3} \mathrm{BO}_{3}$
(p) \Lambdaqua fortis
B. $11_{3} \mathrm{PO}_{\text {i }}$
(q) Nccdle like crysrals
(r) With $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$, burris
C. $1 \mathrm{lNO}_{3}$ with green flame
[). $11 \mathrm{PO}_{3}$
(s) Stabilize for $\mathrm{II}_{2} \mathrm{O}_{2}$
(r) Transparent glassy solid

Vishal Sharma

Numerade Educator

Problem 145

Match the following:
Column I $\quad$ Column II $\left(\right.$ Metal with $\left.\mathrm{HNO}_{3}\right)$
A. $\mathrm{Mg}+$ very dil. $\mathrm{l} 1 \mathrm{NO}_{3}$
(p) I I $_{2}$
B Lin ? dil. HNO $_{3}$
(y) $\mathrm{NO}$
C. Sn ? dil. $\mathrm{HNO}_{3}$
(r) $\mathrm{NH}_{1} \mathrm{NO}_{3}$
[). $\mathrm{Pb}+$ dil. $\mathrm{I} \mathrm{INO}_{3}$
(s) $\mathrm{N}_{2} \mathrm{O}$

Vishal Sharma

Numerade Educator

Problem 146

Which one of the following species is not a pseudohalide?
(a) CNO-
(b) $\mathrm{RCOO}^{-}$
(c) $\mathrm{OCN}^{-}$
(d) NNN'

Shahina -

Numerade Educator

Problem 147

White phosphorus ( $\mathrm{P}_{i}$ ) has
I. six $\mathbf{P}$ P sigma bonds
II. four $\mathrm{P}$ P single bonds
III. four lore pairs of electrons
IV. PPP anglc of $60^{\circ}$
(a) $1,2,3$
(b) $2,3,1$
(c) $1,3,1$
(d) $\Lambda \mathrm{ll}$ are correct

Shahina -

Numerade Educator

Problem 148

One mole of calcium phosphide on reaction with cxcess water gives
(a) one mole of phosphine
(b) tho moles of phosphoric acid
(c) two moles of phosphine
(d) one mole of phosphorus pentroxide

Shahina -

Numerade Educator

Problem 149

On heating ammonium dichromate, the gas evolved is
(a) oxygen
(b) ammonia
(c) nitrous oxide
(d) nitrogen

Shahina -

Numerade Educator

Problem 150

Ammonia on reaction with hypochlorite anion can form
I NO II $\mathrm{NH}_{4} \mathrm{Cl}$
III $\mathrm{N}_{2} \mathrm{H}_{4} \quad$ IV $\mathrm{HNO}_{2}$
(a) 1,2
(b) 2,3
(c) 3,4
(d) $2,3,4$

Shahina -

Numerade Educator

Problem 151

In compounds of the type $\mathrm{ECl}_{3}$, where $\mathbf{E}=\mathrm{B}, \mathrm{P}$ $\Lambda \mathrm{s}$ or $\mathrm{Bi}$, the angle $\mathrm{Cl} \mathrm{E}$ Cl for differerit $\mathrm{E}$ are in the order
(a) $\mathrm{B}>\mathrm{P}=\Lambda \mathrm{s}=\mathrm{Bi}$
(b) $\mathbf{B}>\mathrm{P}>\mathrm{As}>\mathrm{Bi}$
(c) $\mathrm{B}<\mathrm{P}=\Lambda \mathrm{s}=\mathrm{B}_{\mathrm{i}}$
(d) $\mathbf{B}<\mathrm{P}<\Lambda \mathrm{s}<\mathrm{Bi}$

Vishal Sharma

Numerade Educator

Problem 152

The number of $\mathrm{P}$ O $\mathrm{P}$ bonds in cyclic metaphosphoric acid is
(a) zero
(b) two
(c) three
(d) four

Shahina -

Numerade Educator

Problem 153

Ammonia can be dried by
(a) Conc. $\mathrm{II}_{2} \mathrm{SO}_{1}$
(b) $\mathrm{P}_{0} \mathrm{O}_{\mathrm{m}}$
(c) $\mathrm{CaO}$
(d) anhydrous $\mathrm{CaCl}_{2}$

Shahina -

Numerade Educator

Problem 154

For $\mathrm{H}_{3} \mathrm{PO}_{3}$ and $\mathrm{H}_{3} \mathrm{PO}_{4}$ the correct choice is
(a) $\mathrm{II}_{3} \mathrm{PO}_{3}$ is dibasic and reducing
(b) $11_{3} \mathrm{PO}_{3}$ is dibasic and nonreducing
(c) $\mathrm{H}_{3} \mathrm{PO}_{1}$ is tribasic and reducing
(d) H PO is tribasic and nonerducing

Shahina -

Numerade Educator

Problem 155

$(\mathrm{Me})_{2} \mathrm{SiCl}_{2}$ on hydrolysis will produce
(a) $(\mathrm{Me})_{2} \mathrm{Si}(\mathrm{OH})_{2}$
(b) $(\mathrm{Mc}) \mathrm{Si}-\mathrm{O}$
(c) $-\left[-\mathrm{O}-(\mathrm{Mc})_{2} \mathrm{SI}-\mathrm{O}-\right]_{n}-$
(d) $\mathrm{Mc}$, SiCl(OI 1)

Vishal Sharma

Numerade Educator

Problem 156

$\mathrm{H}_{3} \mathrm{BO}_{3}$ is
(a) monobasic and a weak Lewis acid.
(b) monobasic and a weak bronsted acid.
(c) monobasic and a strong lewis acid.
(d) tribasic and a weak bronsted acid.

Shahina -

Numerade Educator

Problem 157

$\left(\mathrm{N} 11_{i}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ on hearing liberates a gas. The
same gas will be obtained by
(a) Heating $\mathrm{NH}_{4} \mathrm{NO}_{2}$
(b) Heating $\mathrm{NH}_{4} \mathrm{NO}_{3}$
(c) Treating $11 \mathrm{O}_{2} \mathrm{O}_{2}$ with $\mathrm{NaNO}_{2}$
(d) Treating $\mathrm{Mg}_{3} \mathrm{~N}_{2}$ with $\mathrm{H}_{2} \mathrm{O}$

Vishal Sharma

Numerade Educator

Problem 158

$\left[\mathrm{SiO}_{4}\right]^{+}$ has tetrahedral structure. I he silicate formed by using three oxygen atoms has a
(a) Two dimensional sheet structure
(b) Pyrosilicate structure
(c) Linear polymeric structure
(d) Three dimensional structure

Vishal Sharma

Numerade Educator

Problem 159

The blue liquid formed by equimolar mixture of two gases at $30^{\circ} \mathrm{C}$ is
(a) $\mathrm{N}_{2} \mathrm{O}$
(b) $\mathrm{N}_{2} \mathrm{O}_{3}$
(c) $\mathrm{N}, \mathrm{O}_{3}$
(d) $\mathrm{N}, \mathrm{O}$

Shahina -

Numerade Educator

Problem 160

$\mathrm{B}(\mathrm{Oll})_{3}+\mathrm{NaO} 11+\mathrm{NaBO}_{2}+\mathrm{Na}\left[\mathrm{B}(\mathrm{O} 1 \mathrm{l})_{j}\right]$
$1 \mathrm{H}_{2} \mathrm{O}$
How can this reaction be made to proceed in forward direction?

Vishal Sharma

Numerade Educator

Problem 161

The species present in solution when $C O_{2}$ is dissolved in water are
(a) $\mathrm{CO}_{2}, \mathrm{H}_{2} \mathrm{CO}_{3}, \mathrm{HCO}_{3}-, \mathrm{CO}_{3}{ }^{2-}$
(b) $\mathrm{I} 1_{2} \mathrm{CO}_{3}, \mathrm{CO}_{3}^{2}$
(c) $\mathrm{CO}_{3}^{2}, \mathrm{IlCO}_{3}-$
(d) $\mathrm{CO}_{2}, \mathrm{II}_{2} \mathrm{CO}_{3}$

Vishal Sharma

Numerade Educator

Problem 162

A solution of colorless salt H or boiling excess NaOH produces a nonflammable gas. 'the gas evolution ceases after sometime. Upon the addition of Zn dust to the same solution, the gas evolution restarts. The colorless salt
(s) $\mathrm{H}$ is (are)
(a) $\mathrm{N} 11 \mathrm{NO}_{3}$
(b) $\mathrm{NII}_{4} \mathrm{NO}_{2}$
(c) $\mathrm{N} 1 \mathrm{l}_{\mathrm{j}} \mathrm{Cl}$
(d) $\left(\mathrm{NI} \mathrm{l}_{f}\right)_{2} \mathrm{SO}_{\mathrm{A}}$

Vishal Sharma

Numerade Educator

Problem 163

'the nitrogen oxides that Contain $\mathrm{N}-\mathrm{N}$ borid $/ \mathrm{s}$ is/are
(a) $\mathrm{N}_{2} \mathrm{O}$
(b) $\mathrm{N}_{2} \mathrm{O}$
(c) $\mathrm{N}_{2} \mathrm{O}_{4}$
(d) $\mathrm{N}_{2} \mathrm{O}_{5}$

Shahina -

Numerade Educator

Problem 164

Match each of the reactions given in column I with the Product(s) giver in column II
Column I $\quad$ Column II
$\Lambda$ Cu dil. HNO $_{3}$
(p) NO
B $\mathrm{Cu}+$ conc. $11 \mathrm{NO}_{3}$
(q) $\mathrm{NO}_{2}$
C $7 \mathrm{n}+$ dil. $11 \mathrm{NO}_{3}$
(r) $\mathrm{N}_{2} \mathrm{O}$
1) $7 \mathrm{n}+$ conc. $\mathrm{IINO}_{\mathrm{a}}$
(s) $\mathrm{Cu}\left(\mathrm{NO}_{3}\right)_{2}$
(r) $7 . n\left(\mathrm{NO}_{3}\right)_{2}$

Vishal Sharma

Numerade Educator