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Environmental Chemistry

134 Questions Start JEE Mains Test
All Exams JEE Mains JEE Advanced TS-EAMCET AP-EAPCET BITSAT
2020 Q101 TS-EAMCET MCQ
20 May 2026

Acid rain is mainly caused by the emissions of which of the following gases?

I. Sulphur dioxide

II. Carbon dioxide

III. Nitrogen dioxide

IV. Methane

A.

I and II

B.

I, II and III

C.

I and III

D.

I, II, III and IV

2020 Q102 TS-EAMCET MCQ
20 May 2026

Which of the following is air pollutant?

A.

Pesticides

B.

Phosphates

C.

Biphenyls

D.

Oxides of sulphur

2020 Q103 TS-EAMCET MCQ
20 May 2026

Biochemical oxygen demand (BOD) is a measure of organic materials present in water, BOD value less than 5 ppm indicates a water sample to be

A.

rich in dissolved oxygen

B.

poor in dissolved oxygen

C.

highly polluted

D.

not suitable for aquatic life

2020 Q104 BITSAT MCQ
11 Jun 2026

The process of 'eutrophication' is due to the

A.
increase in concentration of insecticide in H2O.
B.
increase in concentration of fluoride ion in H2O.
C.
reduction in concentration of the dissolved oxygen in water due to phosphate pollution in water.
D.
attack of younger leaves of a plant by peroxyacetyl nitrate
2019 Q105 JEE Mains MCQ
14 Mar 2026
The primary pollutant that leads to photochemical smog is :
A.
acrolein
B.
ozone
C.
sulphur dioxide
D.
nitrogen oxides
2019 Q106 JEE Mains MCQ
14 Mar 2026
The correct set of species responsible for the photochemical smog is :
A.
NO, NO2, O3 and hydrocarbons
B.
N2, NO2 and hydrocarbons
C.
CO2, NO2, SO2 and hydrocarbons
D.
N2, O2, O3 and hydrocarbons
2019 Q107 JEE Mains MCQ
14 Mar 2026
Air pollution that occurs in sunlight is :
A.
oxidising smog
B.
reducing smog
C.
fog
D.
acid rain
2019 Q108 JEE Mains MCQ
14 Mar 2026
The regions of the atmosphere, where clouds form and where we live, respectively, are :
A.
Stratosphere and Stratosphere
B.
Stratosphere and Troposphere
C.
Troposphere and Stratosphere
D.
Troposphere and Troposphere
2019 Q109 JEE Mains MCQ
14 Mar 2026
The layer of atmosphere between 10 km to 50 km above the sea level is called as :
A.
mesosphere
B.
thermosphere
C.
troposphere
D.
stratosphere
2019 Q110 JEE Mains MCQ
14 Mar 2026
Excessive release of CO2 into the atomosphere results in :
A.
depletion of ozone
B.
polar vortex
C.
global warming
D.
formation of smog
2019 Q111 JEE Mains MCQ
14 Mar 2026
The maximum prescribed concentration of copper in drinking water is :
A.
3 ppm
B.
5 ppm
C.
0.5 ppm
D.
0.05 ppm
2019 Q112 JEE Mains MCQ
14 Mar 2026
Assertion : Ozone is destroyed by CFCs in the upper stratosphere.

Reason : Ozone holes increase the amount of UV radiation the earth.
A.
Assertion and reason are both correct, and the reason is the correct explanation for the assertion.
B.
Assertion and reason are incorrect.
C.
Assertion and reason are correct but, the reason is not the explanation for the assertion
D.
Assertion is false, but the reason is correct.
2019 Q113 JEE Mains MCQ
14 Mar 2026
Which is wrong with respect to our responsiblity as a human being to protect our environment?
A.
Restricting the use of vehicles
B.
Setting up compost tin in gardens.
C.
Avoiding the use of floodlighted facilities
D.
Using plastic bags.
2019 Q114 JEE Mains MCQ
14 Mar 2026
The compound that is NOT a common component of photochemical smog is :
A.
O3
B.
JEE Main 2019 (Online) 12th January Evening Slot Chemistry - Environmental Chemistry Question 76 English Option 2
C.
CH2 = CHCHO
D.
CF2Cl2
2019 Q115 JEE Mains MCQ
14 Mar 2026
The molecule that has minimum /no role in the formation of photochemical smog, is :
A.
CH2 = O
B.
O3
C.
N2
D.
NO
2019 Q116 JEE Mains MCQ
14 Mar 2026
Water samples with BOD values of 4 ppm and 18 ppm, respectively are :
A.
Clean and Highly polluted
B.
Highly polluted and Clean
C.
Highly polluted and Highly polluted
D.
Clean and Clean
2019 Q117 JEE Mains MCQ
14 Mar 2026
Taj Mahal is being slowly disfigured and discoloured. This is primarily due to :
A.
acid rain
B.
soil pollution
C.
global warming
D.
water pollution
2019 Q118 JEE Mains MCQ
14 Mar 2026
The higher concentration of which gas in air can cause stiffness of flower buds?
A.
CO2
B.
SO2
C.
NO2
D.
CO
2019 Q119 JEE Mains MCQ
14 Mar 2026
Peroxyacetyl nitrate (PAN), an eye irritant is produced by :
A.
classical smog
B.
acid rain
C.
photochemical smog
D.
organic waste
2019 Q120 JEE Mains MCQ
14 Mar 2026
The concentration of dissolved oxygen (DO) in cold water can go upto :
A.
14 ppm
B.
16 ppm
C.
8 ppm
D.
10 ppm
2019 Q121 JEE Mains MCQ
14 Mar 2026
The reaction that is NOT involved in the ozone layer depletion mechanism in the stratosphere is :
A.
$Cl\mathop O\limits^ \bullet \left( g \right) + O\left( g \right) \to \mathop C\limits^ \bullet l\left( g \right) + {O_2}(g)$
B.
$C{F_2}C{l_2}\left( g \right)\,\buildrel {uv} \over \longrightarrow \mathop {\,C}\limits^ \bullet l\left( g \right) + \mathop C\limits^ \bullet {F_2}Cl\left( g \right)$
C.
$C{H_4} + 2{O_3}\, \to \,3C{H_2} = O + 3{H_2}O$
D.
$HOCl\left( g \right)\,\buildrel {hv} \over \longrightarrow \,\mathop O\limits^ \bullet H\left( g \right) + \mathop C\limits^ \bullet l\left( g \right)$
2019 Q122 JEE Mains MCQ
14 Mar 2026
Water filled in two glasses A and B have BOD values of 10 and 20, respectively. The correct statement regarding them, is :
A.
B is more polluted than A.
B.
A is suitable for drinking, whereas B is not .
C.
Both A and B are suitable for dirnking
D.
A is more polluted than B.
2019 Q123 JEE Mains MCQ
14 Mar 2026
Which of the following conditions in drinking water causes methemoglobinemia?
A.
> 50 ppm of lead
B.
> 50 ppm of chloride
C.
> 50 ppm of nitrate
D.
> 100 ppm of sulphate
2019 Q124 JEE Mains MCQ
14 Mar 2026
A water sample has ppm level concentration of the following metals : Fe = 0.2; Mn = 5.0; Cu = 3.0; Zn = 5.0. The metal that makes the water sample unsuitable for drinking is :
A.
Cu
B.
Mn
C.
Fe
D.
Zn
2018 Q125 JEE Mains MCQ
14 Mar 2026
The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting
[3Ca3 (PO4)2.Ca(OH)2] to
A.
[3{Ca(OH)2}. CaF2]
B.
[CaF2]
C.
[3(CaF2). Ca(OH)2]
D.
[3Ca3(PO4)2. CaF2]
2018 Q126 JEE Mains MCQ
14 Mar 2026
Biochemical Oxygen Demand (BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct ?
A.
Aerobic bacteria decrease the BOD value.
B.
Anaerobic bacteria increase the BOD value.
C.
Clean water has BOD value higher than 10 ppm.
D.
Polluted water has BOD value higher than 10 ppm.
2017 Q127 JEE Mains MCQ
14 Mar 2026
Which of the following is a set of greenhouse gases?
A.
CH4, O3, N2, SO2
B.
O3, N2, CO2, NO2
C.
O3, NO2, SO2, Cl2
D.
CO2, CH4, N2O, O3
2017 Q128 JEE Mains MCQ
14 Mar 2026
Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal.
A.
O3 and CO2
B.
CO2 and NO2
C.
SO2 and NO2
D.
SO2 and O3
2017 Q129 JEE Mains MCQ
14 Mar 2026
A water sample has ppm level concentration of following anions
F- = 10; $SO_4^{2-}$ = 100; $NO_3^-$ = 50
The anion/anions that make/makes the water sample unsuitable for drinking is/are :
A.
both $SO_4^{2-}$ and $NO_3^-$
B.
only F-
C.
only $SO_4^{2-}$
D.
only $NO_3^-$
2016 Q130 JEE Mains MCQ
14 Mar 2026
Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution?
A.
Tetrachloroethylene
B.
Carbon dioxide
C.
Sulphur dioxide
D.
Nitrogen dioxide
2016 Q131 JEE Mains MCQ
14 Mar 2026
BOD stands for :
A.
Biological Oxygen Demand
B.
Bacterial Oxidation Demand
C.
Biochemical Oxygen Demand
D.
Biochemical Oxidation Demand
2016 Q132 JEE Mains MCQ
14 Mar 2026
The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to high concentration of :
A.
Lead
B.
Nitrate
C.
Iron
D.
Fluoride
2008 Q133 JEE Mains MCQ
14 Mar 2026
Identify the wrong statements in the following :
A.
Chlorofluorocarbons are responsible for ozone layer depletion
B.
Greenhouse effect is responsible for global warming
C.
Ozone layer does not permit infrared radiation from the sun to reach the earth
D.
Acid rains is mostly because of oxides of nitrogen and sulphur
2004 Q134 JEE Mains MCQ
14 Mar 2026
The smog is essentially caused by the presence of :
A.
O2 and O3c
B.
O3 and N2
C.
Oxides of sulphur and nitrogen
D.
O2 and N2