A Complete Resource Book in Chemistry for JEE Main

A.K. Singhal

Chapter 33

Environment Chemistry - all with Video Answers

Educators

Chapter Questions

Problem 1

Which among these gives the measure of organic pollution in water?
(a) COD
(b) DO
(c) $\mathrm{pH}$
(d) salinity

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 2

The medium which interacts with the long lived pollutant is
(a) source
(b) receptor
(c) sink
(d) all

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 3

Which of the following is a contaminant?
(a) $\mathrm{CO}$
(b) $\mathrm{CO}_{2}$
(c) $\mathrm{SO}_{2}$
(d) leakage of MIC

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 4

Which statement is correct about biodegradable materials?
(a) these are toxic in nature
(b) these can be broken down by bacteria
(c) these are used for converting waste to greenery
(d) these spoil the biological environment

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 5

Fluoride in water is removed using precipitation method by
(a) lime and alum
(b) lime, alum and bleaching powder
(c) activated carbon
(d) defluoron

Vishal Sharma

Numerade Educator

Problem 6

DDT is
(a) a non degradable pollutant
(b) a fertilizer
(c) an antibiotic
(d) dichloro difluoro titanium

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 7

Cyclon collector is used for minimizing
(a) water pollution
(b) sound pollution
(c) soil pollution
(d) air pollution

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 8

In Antarctica, ozone depletion is due to the formation of compound.
(a) $\mathrm{SO}_{2}$ and $\mathrm{SO}_{3}$
(b) chlorine nitrate
(c) acrolein (d)
(d) formaldehyde

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 9

Household fuel (LPG) mainly contains
(a) $\mathrm{CH}_{4}$
(b) $\mathrm{C}_{2} \mathrm{H}_{2}$
(c) $\mathrm{C}_{2} \mathrm{H}_{4}$
(d) $\mathrm{C}_{4} \mathrm{H}_{10}$

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 10

$\mathrm{CFCl}_{3}$ is responsible for the decomposition of ozone into oxygen. Which of the following reacts with ozone to form oxygen?
(a) $\mathrm{Cl}_{2}$
(b) $\mathrm{Cl}^{-}$
(c) $\mathrm{F}^{-}$
(d) $\mathrm{Cl}^{*}$

Narayan Hari

Numerade Educator

Problem 11

Biosphere includes
(a) plants and animals
(b) rocks and minerals
(c) atmosphere and lithosphere
(d) water sources

Vishal Sharma

Numerade Educator

Problem 12

The major components of the atmosphere are
(a) $\mathrm{CO}_{2}$ and $\mathrm{N}_{2}$
(b) $\mathrm{O}_{3}$ and $\mathrm{SO}_{2}$
(c) $\mathrm{CO}$ and $\mathrm{CO}_{2}$
(d) $\mathrm{N}_{2}$ and $\mathrm{O}_{2}$

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 13

The upper most region of the atmosphere is
(a) troposphere
(b) exosphere
(c) stratosphere
(d) ionosphere

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 14

The point of temperature inversion between troposphere and ionosphere is called
(a) mesopause
(b) stratopause
(c) ionopause
(d) tropopause

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 15

$\mathrm{BOD}$ is connected with
(a) microbes
(b) organic matter
(c) both (a) and (b)
(d) none of these

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 16

Biodegradable pollutant is
(a) DDT
(b) domestic waste
(c) aluminium foil
(d) mercury salt

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 17

Minamata disease is caused due to the presence of $\ldots \ldots$ in water.
(a) $\mathrm{Hg}$
(b) $\mathrm{Pb}$
(c) $\mathrm{Cd}$
(d) As

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 18

Which one of the following is an invaluable source of energy but does not cause pollution?
(a) fossil fuels
(b) nuclear energy
(c) sun
(d) petroleum.

Narayan Hari

Numerade Educator

Problem 19

Water is often treated with chlorine to
(a) kill germs
(b) remove hardness
(c) increase oxygen content
(d) remove suspended particles

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 20

Major sources of NOx pollutants are
(a) natural gas
(b) gasoline
(c) combustion of coal and oil
(d) all of these

Maryam Riaz

Numerade Educator

Problem 21

Ozone hole refers to
(a) hole in ozone layer
(b) reduction in the thickness of ozone layer in stratosphere
(c) reduction in the thickness of ozone layer in troposphere
(d) increased concentration of ozone

Narayan Hari

Numerade Educator

Problem 22

Which of the following is a primary pollutant?
(a) $\mathrm{PAN}$
(b) aldehydes
(c) $\mathrm{CO}$
(d) $\mathrm{H}_{2} \mathrm{SO}_{4}$

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 23

Which of the following is not regarded as a pollutant?
(a) $\mathrm{CO}_{2}$
(b) $\mathrm{O}_{3}$
(c) $\mathrm{NO}_{2}$
(d) hydrocarbons

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 24

Which of the following is not a greenhouse gas?
(a) water vapour
(b) $\mathrm{CO}_{2}$
(c) $\mathrm{O}_{2}$
(d) $\mathrm{CH}_{4}$

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 25

The greenhouse effect is
(a) rise in temperature of the earth
(b) rise in pressure on the earth
(c) decrease in oxygen content of the earth's atmo-sphere
(d) decrease in CO $_{2}$ content of earth's atmosphere

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 26

Which of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere?
(a) freons
(b) ferrocene
(c) fullerenes
(d) polyhalogens

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 27

Ozone in stratosphere is depleted by
(a) $\mathrm{C}_{7} \mathrm{~F}_{16}$
(b) $\mathrm{C}_{6} \mathrm{~F}_{6}$
(c) $\mathrm{CF}_{2} \mathrm{Cl}_{2}$
(d) $\mathrm{C}_{6} \mathrm{H}_{6} \mathrm{Cl}_{6}$

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 28

Which of the following is not an air pollutant?
(a) $\mathrm{N}_{2} \mathrm{O}$
(b) $\mathrm{N}_{2}$
(c) $\mathrm{CO}$
(d) $\mathrm{NO}$

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 29

Control of pollution is possible by
(a) developing bio remedies
(b) planting trees
(c) controlling the population growth
(d) all of these

Vishal Sharma

Numerade Educator

Problem 30

By green chemistry we mean
(a) performing only those reactions which are of biological origin
(b) the use of non toxic reagents and solvents to produce environmental friendly products
(c) producing chemicals of our daily use from greenhouse gases
(d) performing chemical processes which use green plants

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 31

Acid rain
(a) retards the growth of trees
(b) effects big marble constructions
(c) results in loss of flora and fauna
(d) all of these

Vishal Sharma

Numerade Educator

Problem 32

The industrial usage of fluorocarbons is very high because
(a) they are unstable
(b) they are gases
(c) they can be manufactured cheaply
(d) their reactivity is high

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 33

Hydrosphere includes various forms of water as
(a) polar ice caps and ground water
(b) oceans and lakes
(c) sea and rivers
(d) all of these

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 34

The presence of fluoride ion in polluted water can be detected by using
(a) KI+ starch
(b) zirconium alizarin-S dye
(c) $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+50 \% \mathrm{H}_{2} \mathrm{SO}_{4}$
(d) sodium nitroprusside

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 35

The phosphates present in sewage water which cause eutrophication can be removed by adding
(a) alum
(b) chlorine
(c) lime
(d) permanganate

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 36

Ozone is an important constituent of stratosphere because it
(a) removes poisonous gases of the atmosphere by reacting with them
(b) destroys bacteria which are harmful to human life
(c) prevents the formation of smog over large cities
(d) absorbs ultraviolet radiation which is harmful to human life

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 37

$\mathrm{SO}_{2}$ is a dangerous air pollutant and harms plant life. What changes in the plant indicate its toxic effects?
(a) falling of leaves
(b) bleaching of leaves
(d) withering of leaves
(c) darkening of leaves

Vishal Sharma

Numerade Educator

Problem 38

The excessive use of phosphates as water softeners leads to aquatic pollution called
(a) eutrophication
(b) phosphorylation
(c) deoxygenation
(d) denitrification

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 39

Spraying of DDT causes pollution of
(a) air
(b) air and water
(c) air and soil
(d) air, water and soil

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 40

Which of the following causes water pollution?
(a) fly ash
(b) pesticides
(c) auto exhausts
(d) aeroplanes

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 41

Ozone layer is present in
(a) stratosphere
(b) troposphere
(c) mesosphere
(d) exosphere

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 42

Human ear can tolerate noise upto
(a) 100 decible
(b) 80 decible
(c) 60 decible
(d) 40 decible

Vishal Sharma

Numerade Educator

Problem 43

Sound pollution is mainly due to
(a) industrial estates
(b) airport, railway stations
(c) sound systems
(d) all of these

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 44

Ozone hole is maximum over
(a) Africa
(b) Europe
(c) Antarctica
(d) India

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 45

Ozone layer of stratosphere requires protection from indiscriminate use of
(a) aerosols and high flying jets
(b) balloons
(c) pesticides
(d) atomic explosions

Vishal Sharma

Numerade Educator

Problem 46

Sound pollution does not cause
(a) mental disorder
(b) hearing problems
(c) headache
(d) skin diseases

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 47

Proper management for disposal of household and industrial wastes can be done by
(a) sewage treatment
(b) recycling the waste material to give useful products again
(c) burning and incineration of combustible waste
(d) all of these

Vishal Sharma

Numerade Educator

Problem 48

Contaminant is
(a) a pollutant released from the industries
(b) a pollutant
(c) a component originally not present in environment but released into environment by human activity
(d) a pollutant released into the environment in natural calamites

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 49

Untreated domestic sewage has a low
(a) persentage of dissolved oxygen
(b) persentage of suspended organic matter
(c) BOD value
(d) amount of dissolved salts

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 50

Presence of which of the following in the atmosphere will cause the depletion of ozone?
(a) chlorofluoro carbons
(b) $\mathrm{Cl}_{2}$
(c) NO
(d) any one of these

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 51

There is a possibility of melting of polar ice caps and increase in the level of sea water due to
(a) greenhouse effect
(b) acid rain
(c) depletion of ozone layer
(d) any one of these

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 52

Which of the following gases cause pollution when present in the exhaust fumes of vehicles?
(a) water vapours
(b) $\mathrm{CO}_{2}$
(c) $\mathrm{CO}$
(d) $\mathrm{C}_{2} \mathrm{H}_{6}$

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 53

The poisonous gas present in the exhaust fumes of car is
(a) $\mathrm{CO}_{2}$
(b) $\mathrm{CO}$
(c) $\mathrm{CH}_{4}$
(d) $\mathrm{C}_{2} \mathrm{H}_{2}$

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 54

Incomplete combustion of petrol or diesel in automobile engines can be best detected by testing the fuel gases for the presence of
(a) sulphur dioxide
(b) nitrogen dioxide
(c) carbon monoxide
(d) carbon monoxide and water vapour

Vishal Sharma

Numerade Educator

Problem 55

Which one of the following regions of atmosphere contains ozone?
(a) troposphere
(b) stratosphere
(c) mesosphere
(d) thermosphere

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 56

The greenhouse effect is caused by
(a) $\mathrm{CO}$
(b) $\mathrm{NO}$
(c) $\mathrm{NO}_{2}$
(d) $\mathrm{CO}_{2}$

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 57

Surface water contains
(a) only salt
(b) organic matter
(c) salt and organic matter
(d) suspended impurity

Vishal Sharma

Numerade Educator

Problem 58

An object is located at a height of $5 \mathrm{~km}$ from the surface of the earth. The object is located in which part of atmosphere?
(a) thermosphere
(b) mesosphere
(c) stratosphere
(d) troposphere

Narayan Hari

Numerade Educator

Problem 59

Among the following, all except which causes pollution?
(a) nuclear power plant
(b) thermal power plant
(c) hydro-electric plant
(d) automobiles

Vishal Sharma

Numerade Educator

Problem 60

Which factor among the following is the most harmful for life on the globe?
(a) soil erosion
(b) nuclear fall out
(c) increasing desert
(d) deforestation

Vishal Sharma

Numerade Educator

Problem 61

Which air pollutant is not released by automobiles?
(a) fly ash
(b) $\mathrm{CO}$
(c) $\mathrm{SO}_{2}$
(d) hydrocarbons

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 62

Taj Mahal is threatened due to the effect of
(a) hydrogen
(b) oxygen
(c) chlorine
(d) sulphur dioxide

Narayan Hari

Numerade Educator

Problem 63

Photochemical oxidants such as PAN and PBN are formed
(a) by the action of hydrogen sulphide on hydrocarbons in the presence of sunlight
(b) by the action of carbon dioxide on hydrocarbons in the presence of sunlight
(c) by the action of nitrogen oxides on hydrocarbons in the presence of sunlight
(d) none of these

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 64

Which of the following statements are true?
(1) London smog is oxidizing in nature.
(2) London smog is a mixture of smoke and fog.
(3) Photochemical smog causes irritation in eyes.
(4) Photochemical smog results in the formation of PAN.
(a) 1,2 and 3
(b) 1,2 and 4
(c) 2,3 and 4
(d) 1,3 and 4

Vishal Sharma

Numerade Educator

Problem 65

Which of the following statements are correct?
(1) Ammonia acts as a sink for $\mathrm{NOx}$.
(2) The average residence time of $\mathrm{NO}$ is one month.
(3) SOx can be removed from flue gases by passing through a solution of citrate ions.
(4) Limestone acts as a sink for $\mathrm{SOx}$.
(a) 1,3 and 4
(b) 1,2 and 4
(c) 2,3 and 4
(d) 1,2 and 3

Vishal Sharma

Numerade Educator

Problem 66

Fluorocarbons are effective scavengers for ozone due to
(a) photolytic production of oxides of nitrogen
(b) photolytic decomposition of $\mathrm{O}_{3}$ by $\mathrm{Cl}$ into $\mathrm{O}_{2}$
(c) photolytic decomposition of $\mathrm{O}_{3}$ producing $\mathrm{O}_{2}$
(d) photolytic reaction of $\mathrm{O}_{2}$ producing $\mathrm{Cl}$ radicals

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 67

Which of the following statements are true?
(1) Temperature inversion is caused by smog.
(2) A product of photochemical smog is PAN.
(3) $\mathrm{O}_{3}$ is involved in photochemical smog.
(4) $\mathrm{O}_{3}$ layer is destroyed by fluorocarbons.
(a) 1,2 and 3
(b) 1,2 and 4
(c) 2,3 and 4
(d) 1,3 and 4

Vishal Sharma

Numerade Educator

Problem 68

Which of the following statements are incorrect about ozone layer?
1. it is beneficial because ozone cuts-off the ultraviolet radiation of the sun
2. it is harmful because ozone cuts out the important radiation of the sun which are vital for photosynthesis
3. it is harmful because ozone is dangerous to living organisms
4. it is beneficial because oxidation reaction can proceed faster in the presence of ozone
(a) 1,2 and 3
(b) 1,2 and 4
(c) 3 and 4 only
(d) 2,3 and 4

Maryam Riaz

Numerade Educator

Problem 69

About $20 \mathrm{~km}$ above the earth there is an ozone layer. Which of the following statements about ozone and ozone layer are false?
(1) The conversion of ozone to oxygen is an endothermic reaction.
(2) Ozone layer is beneficial to us because ozone cuts out the ultraviolet radiation of the sun.
(3) Ozone layer is harmful to us because it cuts off radiations useful for photosynthesis.
(4) Ozone has a triatomic linear molecule.
(a) 1,2 and 3
(b) 1,3 and 4
(c) 2,3 and 4
(d) 3 and 4 only

Maryam Riaz

Numerade Educator

Problem 70

Ozone is formed in the upper layer of the atmosphere from oxygen by the action of
(a) cosmic rays
(b) ultraviolet rays
(c) free radicals
(d) nitrogen oxides

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 71

Pick up the incorrect statements here.
(1) Classical smog is good for health but not photochemical smog.
(2) During formation of smog the level of ozone in the atmosphere goes down.
(3) Classical smog has an oxidizing character while the photochemical smog is reducing in character.
(4) Photochemical smog occurs in day time whereas the classical smog occurs in early morning hours.
(a) 1,2 and 3
(b) 1,3 and 4
(c) 2 and 3 only
(d) 3 and 4 only

Vishal Sharma

Numerade Educator

Problem 72

Which statements are correct here?
(1) $\mathrm{H}_{2} \mathrm{SO}_{4}$ particulates have size of $500-1000 \mathrm{~nm}$.
(2) Soot particles have a diameter of about $5 \mathrm{~nm}$.
(3) Fly ash particles have diameter of $5 \times 10^{5} \mathrm{~nm}$.
(a) 1 and 2
(b) 2 and 3
(c) 1 and 3
(d) 1,2 and 3

Vishal Sharma

Numerade Educator

Problem 73

Use of chlorofluoro carbons is not encouraged because
(a) they are harmful to the eyes of people that use it
(b) they damage the refrigerators and air conditioners
(c) they eat away the ozone in the atmosphere
(d) they destroy the oxygen layer

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 74

Consider the following statements:
(1) PAN is secondary air pollutant
(2) BOD and COD values are indicators of water pollution level. Which of the statements given above is/are correct?
(a) both 1 and 2
(b) 1 only
(c) 2 only
(d) neither 1 nor 2

Vishal Sharma

Numerade Educator

Problem 75

Match the list I and list II and pick the correct matching from the codes given below.
List
(a) Peroxy acetyl nitrate
(b) Polycyclic aromatic hydrocarbons
(c) Dioxins
List II
1. Waste incineration
2. Global warming
3. Photochemical smog
4. Carcinogens
5. Vat dye
(e) IR active molecules
(a) a 3, b 4, c 1, d 5, e 2
(b) a $2, \mathrm{~b} 3, \mathrm{c} 5, \mathrm{~d} 4, \mathrm{e} 1$
(c) a $5, \mathrm{~b} 3, \mathrm{c} 1, \mathrm{~d} 2, \mathrm{e} 4$
(d) a $1, \mathrm{~b} 2, \mathrm{c} 3, \mathrm{~d} 4, \mathrm{e} 5$

Vishal Sharma

Numerade Educator

Problem 76

When rain is accompanied by a thunderstorm, the collected rain water will have a pH value
(a) which depends upon the amount of dust in the air
(b) slightly lower than that of rain water without the thunderstorm
(c) slightly higher than that when the thunderstorm is not here
(d) uninfluenced by occurrence of thunderstorm

Vishal Sharma

Numerade Educator

Problem 77

Smog is essentially caused by presence of
(a) $\mathrm{O}_{2}$ and $\mathrm{N}_{2}$
(b) $\mathrm{O}_{2}$ and $\mathrm{O}_{3}$
(c) $\mathrm{O}_{3}$ and $\mathrm{N}_{2}$
(d) oxides of sulphur and nitrogen

Vishal Sharma

Numerade Educator

Problem 78

Identify the wrong statements in the following:
(a) Chlorofluorocarbons are responsible for ozone layer depletion
(b) Green house effect is responsible for global warming.
(c) Ozone layer does not permit infrared radiation from the sun to react the earth.
(d) Acid rains is mostly because of oxides of nitrogen and sulphur.

Vishal Sharma

Numerade Educator

Problem 79

What is DDT among the following-
(a) Biodegradable pollutant
(b) A fertilizer
(c) Greenhouse gas
(d) Non - biodegradabl pollutant

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 80

The gas leaked from a storage tank of the Union Carbide plant in Bhopal gas tragedy was:
(a) Ammonia
(b) Phosgene
(c) Methylisocynate
(d) Methylamine

Ishu Khandelwal

Ishu Khandelwal

Numerade Educator

Problem 81

The Concentration of fluoride, Lead, nitrate and iron in a water sample from an Under ground lake was Found to be $1000 \mathrm{PPb} 40 \mathrm{PPb}, 100 \mathrm{PPm}$, and $0.2 \mathrm{PPm}$ respec-
tively this water is unsuitable for drinking due to high Concentration of
(a) Laed
(b) Nitrate
(c) fiuoride
(d) Iron

Vishal Sharma

Numerade Educator