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Environmental Chemistry

132 Questions
All Exams JEE Mains JEE Advanced TS-EAMCET AP-EAPCET
2022 JEE Mains MCQ
JEE Main 2022 (Online) 28th July Morning Shift

Given below are two statements:

Statement I : In polluted water values of both dissolved oxygen and $\mathrm{BOD}$ are very low.

Statement II : Eutrophication results in decrease in the amount of dissolved oxygen.

In the light of the above statements, choose the most appropriate answer from the options given below :

A.
Both Statement I and Statement II are true
B.
Both Statement I and Statement II are false
C.
Statement I is true but Statement II is false
D.
Statement I is false but Statement II is true
2022 JEE Mains MCQ
JEE Main 2022 (Online) 27th July Evening Shift

Given below are two statements:

Statement I : The non bio-degradable fly ash and slag from steel industry can be used by cement industry.

Statement II : The fuel obtained from plastic waste is lead free.

In the light of the above statements, choose the most appropriate answer from the options given below :

A.
Both Statement I and Statement II are correct
B.
Both Statement I and Statement II are incorrect
C.
Statement I is correct but Statement II is incorrect
D.
Statement I is incorrect but Statement II is correct
2022 JEE Mains MCQ
JEE Main 2022 (Online) 27th July Morning Shift

Match List I with List II.

List I

Pollutant		 List II

Disease/sickness
(A) Sulphate (>500 ppm) (I) Methemoglobinemia
(B) Nitrate (>50 ppm) (II) Brown mottling of teeth
(C) Lead (>50 ppb) (III) Laxative effect
(D) Fluoride (>2 ppm) (IV) Kidney damage

Choose the correct answer from the options given below :

A.
A-IV, B-I, C-II, D-III
B.
A-III, B-I, C-IV, D-II
C.
A-II, B-IV, C-I, D-III
D.
A-II, B-IV, C-III, D-I
2022 JEE Mains MCQ
JEE Main 2022 (Online) 26th July Evening Shift

Match List I with List II.

List I

Pollutant		 List II

Source
(A) Microorganisms (I) Strip mining
(B) Plant nutrients (II) Domestic sewage
(C) Toxic heavy metals (III) Chemical fertilizer
(D) Sediment (IV) Chemical factory

Choose the correct answer from the options given below :

A.
A-II, B-III, C-IV, D-I
B.
A-II, B-I, C-IV D-III
C.
A-I, B-IV, C-II, D-III
D.
A-I, B-IV, C-III, D-II
2022 JEE Mains MCQ
JEE Main 2022 (Online) 25th July Morning Shift

The photochemical smog does not generally contain :

A.
NO
B.
NO2
C.
SO2
D.
HCHO
2022 JEE Mains MCQ
JEE Main 2022 (Online) 29th June Morning Shift

The acid that is believed to be mainly responsible for the damage of Taj Mahal is :

A.
sulfuric acid.
B.
hydrofluoric acid.
C.
phosphoric acid.
D.
hydrochloric acid.
2022 JEE Mains MCQ
JEE Main 2022 (Online) 28th June Evening Shift

Correct statement about photo-chemical smog is :

A.
It occurs in humid climate.
B.
It is a mixture of smoke, fog and SO2.
C.
It is reducing smog.
D.
It results from reaction of unsaturated hydrocarbons.
2022 JEE Mains MCQ
JEE Main 2022 (Online) 27th June Evening Shift

On the surface of polar stratospheric clouds, hydrolysis of chlorine nitrite gives A and B while its reaction with its reaction with HCl produces B and C. A, B and C are, respectively :

A.
HOCl, HNO3, Cl2
B.
Cl2, HNO3, HOCl
C.
HClO2, HNO2, HOCl
D.
HOCl, HNO2, Cl2O
2022 JEE Mains MCQ
JEE Main 2022 (Online) 27th June Morning Shift

Given below are two Statements:

Statement I : Classical smog occurs in cool humid climate. It is a reducing mixture of smoke, fog and sulphur dioxide.

Statement II : Photochemical smog has components, ozone, nitric oxide, acrolein, formaldehyde, PAN etc.

In the light of the above statements, choose the most appropriate answer from the options given below.

A.
Both Statement I and Statement II are correct.
B.
Both Statement I and Statement II are incorrect.
C.
Statement I is correct but Statement II is incorrect.
D.
Statement I is incorrect but Statement II is correct.
2022 JEE Mains MCQ
JEE Main 2022 (Online) 26th June Evening Shift

The measured BOD values for four different water samples (A-D) are as follows: A = 3 ppm; B = 18 ppm; C = 21 ppm; D = 4 ppm. The water samples which can be called as highly polluted with organic wastes, are :

A.
A and B
B.
A and D
C.
B and C
D.
B and D
2022 JEE Mains MCQ
JEE Main 2022 (Online) 26th June Morning Shift

Polar stratospheric clouds facilitate the formation of :

A.
ClONO2
B.
HOCl
C.
ClO
D.
CH4
2022 JEE Mains MCQ
JEE Main 2022 (Online) 25th June Evening Shift

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : Polluted water may have a value of BOD of the order of 17 ppm.

Reason R : BOD is a measure of oxygen required to oxidise both the bio-degradable an non-biodegradable organic material in water.

In the light of the above statements, choose the most appropriate answer from the options given below.

A.
Both A and R are correct and R is the correct explanation of A.
B.
Both A and R are correct but R is NOT the correct explanation of A.
C.
A is correct but R is not correct.
D.
A is not correct but R is correct.
2022 JEE Mains MCQ
JEE Main 2022 (Online) 25th June Morning Shift

The eutrophication of water body results in :

A.
loss of Biodiversity.
B.
breakdown of organic matter.
C.
increase in biodiversity.
D.
decrease in BOD.
2022 JEE Mains MCQ
JEE Main 2022 (Online) 24th June Evening Shift

Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous species which does not cause it.

A.
CH4
B.
O3
C.
H2O
D.
N2
2021 JEE Mains MCQ
JEE Main 2021 (Online) 1st September Evening Shift
Water sample is called cleanest on the basis of which one of the BOD values given below :
A.
11 ppm
B.
15 ppm
C.
3 ppm
D.
21 ppm
2021 JEE Mains MCQ
JEE Main 2021 (Online) 31st August Evening Shift
The deposition of X and Y on ground surfaces is referred as wet and dry depositions, respectively. X and Y are :
A.
X = Ammonium salts, Y = CO2
B.
X = SO2, Y = Ammonium salts
C.
X = Ammonium salts, Y = SO2
D.
X = CO2, Y = SO2
2021 JEE Mains MCQ
JEE Main 2021 (Online) 31st August Morning Shift
BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively :
A.
A > 50, B < 27
B.
A > 25, B < 17
C.
A < 5, B > 17
D.
A > 15, B > 47
2021 JEE Mains MCQ
JEE Main 2021 (Online) 27th August Evening Shift
In stratosphere most of the ozone formation is assisted by :
A.
cosmic rays
B.
$\gamma$-rays
C.
ultraviolet radiation
D.
visible radiations
2021 JEE Mains MCQ
JEE Main 2021 (Online) 27th August Evening Shift
Which one of the following is used to remove most of plutonium from spent nuclear fuel?
A.
ClF3
B.
O2F2
C.
I2O5
D.
BrO3
2021 JEE Mains MCQ
JEE Main 2021 (Online) 27th August Morning Shift
The gas 'A' is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by UV-radiations in stratosphere. The intermediates formed initially from the gas 'A' are :
A.
$Cl\mathop O\limits^ \bullet + \mathop C\limits^ \bullet {F_2}Cl$
B.
$Cl\mathop O\limits^ \bullet + C\mathop {{H_3}}\limits^ \bullet $
C.
$\mathop C\limits^ \bullet {H_3} + C\mathop {{F_2}}\limits^ \bullet Cl$
D.
$\mathop C\limits^ \bullet l + C\mathop {{F_2}}\limits^ \bullet Cl$
2021 JEE Mains MCQ
JEE Main 2021 (Online) 26th August Evening Shift
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Photochemical smog causes cracking of rubber.

Reason (R) : Presence of ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate in photochemical smog makes it oxidizing.

Choose the most appropriate answer from the options given below :
A.
Both (A) and (R) are true but (R) is not the true explanation of (A)
B.
(A) is false but (R) is true.
C.
(A) is true but (R) is false.
D.
Both (A) and (R) are true and (R) is the true explanation of (A)
2021 JEE Mains MCQ
JEE Main 2021 (Online) 26th August Morning Shift
The conversion of hydroxyapatite occurs due to presence of F$-$ ions in water. The correct formula of hydroxyapatite is :
A.
[3Ca3(PO4)2 . Ca(OH)2]
B.
[3Ca(OH)2 . CaF2]
C.
[Ca3(PO4)2 . CaF2]
D.
[3Ca3(PO4)2 . CaF2]
2021 JEE Mains MCQ
JEE Main 2021 (Online) 27th July Morning Shift
Which one of the following statements is NOT correct?
A.
Eutrophication indicates that water body is polluted
B.
The dissolved oxygen concentration below 6 ppm inhibits fish growth
C.
Eutrophication leads to increase in the oxygen level in water
D.
Eutrophication leads to anaerobic conditions
2021 JEE Mains MCQ
JEE Main 2021 (Online) 25th July Evening Shift
Given below are two statements :

Statement I : Chlorofluoro breakdown by radiation in the visible energy region and release chlorine gas in the atmosphere which then reacts with stratospheric ozone.

Statement II : Atmospheric ozone reacts with nitric oxide to give nitrogen and oxygen gases, which add to the atmosphere.

For the above statements choose the correct answer from the options given below :
A.
Statement I is incorrect but Statement II is true
B.
Both Statement I and II are false
C.
Statement I is correct but Statement II is false
D.
Both Statement I and II are correct
2021 JEE Mains MCQ
JEE Main 2021 (Online) 20th July Evening Shift
Which one of the following gases is reported to retard photosynthesis?
A.
CO
B.
CFCs
C.
CO2
D.
NO2
2021 JEE Mains MCQ
JEE Main 2021 (Online) 18th March Evening Shift
Given below are two statements :

Statement I : Non-biodegradable wastes are generated by the thermal power plants.

Statement II : Bio-degradable detergents leads to eutrophication.

In the light of the above statements, choose the most appropriate answer from the options given below :
A.
Statement I is false but statement II is true.
B.
Both statement I and statement II are true.
C.
Both statement I and statement II are false.
D.
Statement I is true but statement is false.
2021 JEE Mains MCQ
JEE Main 2021 (Online) 18th March Morning Shift
The statements that are TRUE :

(A) Methane leads to both global warming and photochemical smog

(B) Methane is generated from paddy fields

(C) Methane is a stronger global warming gas than CO2

(D) Methane is a part of reducing smog

Choose the most appropriate answer from the options given below :
A.
(A), (B), (C) only
B.
(A) and (B) only
C.
(B), (C), (D) only
D.
(A), (B), (D) only
2021 JEE Mains MCQ
JEE Main 2021 (Online) 17th March Evening Shift
Which of the following statement(s) is (are) incorrect reason for eutrophication?

(A) excess usage of fertilisers

(B) excess usage of detergents

(C) dense plant population in water bodies

(D) lack of nutrients in water bodies that prevent plant growth

Choose the most appropriate answer from the options given below :
A.
(A) Only
B.
(B) and (D) only
C.
(C) only
D.
(D) only
2021 JEE Mains MCQ
JEE Main 2021 (Online) 17th March Morning Shift
Reducing smog is a mixture of :
A.
Smoke, fog and O3
B.
Smoke, fog and N2O3
C.
Smoke, fog and CH2 = CH $-$ CHO
D.
Smoke, fog and SO2
2021 JEE Mains MCQ
JEE Main 2021 (Online) 16th March Evening Shift
The green house gas/es is (are) :

(A) Carbon dioxide

(B) Oxygen

(C) Water vapour

(D) Methane

Choose the most appropriate answer from the options given below :
A.
(A) and (C) only
B.
(A) and (B) only
C.
(A), (C) and (D) only
D.
(A) only
2021 JEE Mains MCQ
JEE Main 2021 (Online) 16th March Morning Shift
The type of pollution that gets increased during the day time and in the presence of O3 is :
A.
Oxidising smog
B.
Global warming
C.
Acid rain
D.
Reducing smog
2021 JEE Mains MCQ
JEE Main 2021 (Online) 26th February Morning Shift
The presence of ozone in troposphere :
A.
protects us from greenhouse effect
B.
protects us from the UV radiation
C.
protects us from the X-ray radiation
D.
generates photochemical smog
2021 JEE Mains MCQ
JEE Main 2021 (Online) 25th February Evening Shift
Given below are two statements :

Statement I : The pH of rain water is normally 5.6.

Statement II : If the pH of rain water drops below 5.6, it is called acid rain.

In the light of the above statements, choose the correct answer from the options given below :
A.
Both Statement I and Statement II are true.
B.
Both Statement I and Statement II are false.
C.
Statement I is true but Statement II is false.
D.
Statement I is false but Statement II is true.
2021 JEE Mains MCQ
JEE Main 2021 (Online) 25th February Morning Shift
Given below are two statements :

Statement I : An allotrope of oxygen is an important intermediate in the formation of reducing smog.

Statement II : Gases such as oxides of nitrogen and sulphur present in troposphere contribute to the formation of photochemical smog.

In the light of the above statements, choose the correct answer from the options given below :
A.
Statement I is false but Statement II is true
B.
Both Statement I and Statement II are false
C.
Both Statement I and Statement II are true
D.
Statement I is true but Statement II is false
2021 JEE Mains MCQ
JEE Main 2021 (Online) 24th February Evening Shift
Given below are two statements :

Statement I : The value of the parameter "Biochemical Oxygen Demand (BOD)" is important for survival of aquatic life.

Statement II : The optimum value of BOD is 6.5 ppm.

In the light of the above statements, choose the most appropriate answer from the options given below :
A.
Statement I is false but Statement II is true
B.
Statement I is true but Statement II is false
C.
Both Statement I and Statement II are true
D.
Both Statement I and Statement II are false
2021 JEE Mains MCQ
JEE Main 2021 (Online) 24th February Morning Shift
The gas released during anaerobic degradation of vegetation may lead to :
A.
Ozone hole
B.
Corrosion of metals
C.
Acid rain
D.
Global warming and cancer
2021 AP-EAPCET MCQ
AP EAPCET 2021 - 20th August Evening Shift

Identify the coldest region among the following layers of atmosphere.

A.
Troposphere
B.
Mesosphere
C.
Stratosphere
D.
Thermosphere
2021 AP-EAPCET MCQ
AP EAPCET 2021 - 20th August Morning Shift

Which among the following is not a greenhouse gas?

A.
Nitrous oxide
B.
Water vapour
C.
Sulphur dioxide
D.
Methane
2021 AP-EAPCET MCQ
AP EAPCET 2021 - 19th August Evening Shift

Which among the following has the highest concentration of PAN?

A.
Acid rain
B.
Oxidising smog
C.
Reducing smog
D.
Ozone
2021 AP-EAPCET MCQ
AP EAPCET 2021 - 19th August Morning Shift

Green chemistry refers to reactions which

A.
reduce the use and production of hazardous chemicals
B.
study of the extremely slow reactions
C.
are related to soil erosion
D.
study of green leaves
2020 JEE Mains MCQ
JEE Main 2020 (Online) 6th September Morning Slot
The presence of soluble fluoride ion upto 1 ppm concentration in drinking water, is :
A.
safe for teeth
B.
harmful to skin
C.
harmful for teeth
D.
harmful to bones
2020 JEE Mains MCQ
JEE Main 2020 (Online) 5th September Morning Slot
The condition that indicates a polluted environment is :
A.
BOD value of 5 ppm
B.
eutrophication
C.
0.03% of CO2 in the atmosphere
D.
pH of rain water to be 5.6
2020 JEE Mains MCQ
JEE Main 2020 (Online) 4th September Evening Slot
The processes of calcination and roasting in metallurgical industries, respectively, can Iead to :
A.
Global warming and photochemical smog
B.
Photochemical smog and ozone layer depletion
C.
Photochemical smog and global warming
D.
Global warming and acid rain
2020 JEE Mains MCQ
JEE Main 2020 (Online) 3rd September Evening Slot
The incorrect statement(s) among (a) – (d) regarding acid rain is (are) :

(a) It can corrode water pipes.
(b) It can damage structures made up of stone.
(c) It cannot cause respiratory ailments in animals.
(d) It is not harmful for trees
A.
(c) and (d)
B.
(a), (b) and (d)
C.
(c) only
D.
(a), (c) and (d)
2020 JEE Mains MCQ
JEE Main 2020 (Online) 3rd September Morning Slot
Thermal power plants can lead to :
A.
Ozone layer depletion
B.
Blue baby syndrome
C.
Eutrophication
D.
Acid rain
2020 JEE Mains MCQ
JEE Main 2020 (Online) 2nd September Morning Slot
The statement that is not true about ozone is :
A.
In the stratosphere, CFCs release chlorine free radicals (Cl) which reacts with O3 to give chlorine dioxide radicals
B.
It is a toxic gas and its reaction with NO gives NO2.
C.
In the atmosphere, it is depleted by CFCs
D.
In the stratosphere, it forms a protective shield against UV radiation
2020 JEE Mains MCQ
JEE Main 2020 (Online) 9th January Evening Slot
Biochemical Oxygen Demand (BOD) is the amount of oxygen required (in ppm) :
A.
for sustaining life in a water body.
B.
by anaerobic bacteria to breakdown inorganic waste present in a water body.
C.
for the photochemical breakdown of waste present in 1 m3 volume of a water body.
D.
by bacteria to break-down organic waste in a certain volume of a water sample.
2020 JEE Mains MCQ
JEE Main 2020 (Online) 8th January Morning Slot
Among the gases (a) – (e), the gases that cause greenhouse effect are :
(a) CO2
(b) H2O
(c) CFCs
(d) O2
(e) O3
A.
(a), (b), (c) and (d)
B.
(a) and (d)
C.
(a), (b), (c) and (e)
D.
(a), (c), (d) and (e)
2020 TS-EAMCET MCQ
TS EAMCET 2020 (Online) 14th September Evening Shift

The average atmospheric residence time is lowest for which of the given the greenhouse gas?

A.

Carbon dioxide

B.

Methane

C.

Nitrous oxide

D.

Freon

2020 TS-EAMCET MCQ
TS EAMCET 2020 (Online) 14th September Evening Shift

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