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JEE • CHEMISTRY • ENVIRONMENTAL CHEMISTRY

Environmental chemistry practice · Easy

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Practice format and chapter quiz

These sets use single-correct-answer MCQs. They do not cover every JEE Main or JEE Advanced question format and are not full-length mock papers.

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Showing 1-30 of 58 questions

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1 Easy

1 of 58

Remembering +4 | -1

A substance which is not present in nature but added to atmosphere due to human activity and cause adverse effect on environment is called

View answer and explanation

Correct option: A

Pollutant

Option A (Pollutant) is correct because a pollutant is defined as a substance introduced into the environment by human activities that has adverse effects.

2 Easy

2 of 58

Remembering +4 | -1

The main source of atmospheric pollution is

View answer and explanation

Correct option: A

Carbon monoxide

Option A (Carbon monoxide) is correct because carbon monoxide is a major air pollutant produced by incomplete combustion.

3 Easy

3 of 58

Remembering +4 | -1

Lead in water can cause:

View answer and explanation

Correct option: C

Kidney damage

Option C (Kidney damage) is correct because lead poisoning from contaminated water primarily affects the kidneys, leading to kidney damage and dysfunction.

4 Easy

4 of 58

Understanding +4 | -1

The type of pollution that gets increases during the daytime an in the presence of

{O_3}

is:

View answer and explanation

Correct option: D

Oxidising smog

Option D (Oxidising smog) is correct because photochemical smog, which is oxidizing in nature, increases during the daytime in the presence of ozone.

5 Easy

5 of 58

Understanding +4 | -1

The pollution due to oxides of sulphur gets enhanced due to the presence of:
a) Particulate matter, b) Ozone, c) Hydrocarbons, d) Hydrogen peroxide
Choose the most appropriate answer from the options given below.

View answer and explanation

Correct option: C

(a) , (b) , (d) only

Option C ((a) , (b) , (d) only) is correct because particulate matter, ozone, and hydrogen peroxide enhance the pollution caused by sulfur oxides by catalyzing their oxidation.

6 Easy

6 of 58

Remembering +4 | -1

Amongst baking soda, caustic soda and washing soda, carbonate anion is present in

View answer and explanation

Correct option: A

Washing soda only

Option A (Washing soda only) is correct because washing soda (Na2CO3) contains the carbonate anion, while baking soda (NaHCO3) contains the bicarbonate anion and caustic soda (NaOH) contains the hydroxide anion.

7 Easy

7 of 58

Remembering +4 | -1

CFC which is a main reason behind air pollution, is produced by

View answer and explanation

Correct option: B

Aerosols

Option B (Aerosols) is correct because CFCs were commonly used as propellants in aerosols.

8 Easy

8 of 58

Remembering +4 | -1

Ozone depletion in the stratosphere is mainly caused by:

View answer and explanation

Correct option: D

chlorofluorocarbons

Option D (chlorofluorocarbons) is correct because CFCs are the primary cause of ozone depletion in the stratosphere.

9 Easy

9 of 58

Remembering +4 | -1

The regions of the atmosphere, where clouds form and where we live, respectively, are

View answer and explanation

Correct option: B

troposphere and troposphere

Option B (troposphere and troposphere) is correct because clouds form in the troposphere, and we live in the troposphere.

10 Easy

10 of 58

Remembering +4 | -1

Which of the following is not a part of green chemistry?

View answer and explanation

Correct option: C

Nuclear chemistry

Option C (Nuclear chemistry) is correct because green chemistry focuses on environmentally friendly and sustainable chemical processes, while nuclear chemistry involves reactions at the atomic nucleus level, which is not directly related to green chemistry principles.

11 Easy

11 of 58

Understanding +4 | -1

Which of the following statements is false?

View answer and explanation

Correct option: D

Oil slick in a sea water increases DO value

Option D (Oil slick in a sea water increases DO value) is false because oil slicks decrease the dissolved oxygen (DO) value in seawater.

12 Easy

12 of 58

Remembering +4 | -1

Which of the following is not an air pollutant?

View answer and explanation

Correct option: A

{\mathrm{N}_2}

Option A (

\mathrm{N_2}

) is correct because nitrogen gas (

\mathrm{N_2}

) is a major component of clean air and is not considered a pollutant.

13 Easy

13 of 58

Understanding +4 | -1

Ozone is an important constituent of stratosphere because it

View answer and explanation

Correct option: C

Absorbs ultraviolet radiations which is harmful to human life

The correct answer is C (Absorbs ultraviolet radiations which is harmful to human life) because ozone in the stratosphere absorbs harmful UV radiation from the sun.

14 Easy

14 of 58

Remembering +4 | -1

Mesosphere and thermosphere are collectively known as

View answer and explanation

Correct option: C

Ionosphere

Option C (Ionosphere) is correct because the mesosphere and thermosphere collectively form the ionosphere.

15 Easy

15 of 58

Understanding +4 | -1

Measurement of rate of oxygen utilisation by a unit volume of water over a period of time is to measure

View answer and explanation

Correct option: D

Biological oxygen demand

Option D (Biological oxygen demand) is correct because BOD measures the rate of oxygen utilization by microorganisms in water to decompose organic matter.

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16 Easy

16 of 58

Remembering +4 | -1

The main gas involved in the formation classical smog is

\underline \mathrm{A}

and the chemical nature of this smog is

\underline \mathrm{B}

What are A and B respectively?

View answer and explanation

Correct option: D

S{O_2},

reducing

Option D (

S{O_2},

reducing) is correct because classical smog is primarily formed by sulfur dioxide and has a reducing nature.

17 Easy

17 of 58

Analyzing +4 | -1

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 and non-biodegradable organic material in water.
In the light of the above statements, choose the most appropriate answer from the options given below.

View answer and explanation

Correct option: C

A is correct but R is not correct

Option C (A is correct but R is not correct) is correct because while polluted water can have a high BOD, the reason provided incorrectly states that BOD measures both biodegradable and non-biodegradable organic material.

18 Easy

18 of 58

Analyzing +4 | -1

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

Assertion A: Hydrogen is an environment friendly fuel.
Reason R: Atomic number of hydrogen is 1 and it is very light element.
In the light of the above statements, choose the correct answer from the options given below

View answer and explanation

Correct option: C

Both A and R are true but R is NOT the correct explanation of A

Option C is correct because while both statements are true, the atomic number and lightness of hydrogen do not directly explain its environment-friendly nature.

19 Easy

19 of 58

Remembering +4 | -1

Excessive release of

C{O_2}

into the atmosphere results in

View answer and explanation

Correct option: D

global warming

The correct answer is D (global warming) because excessive release of

CO_2

into the atmosphere traps heat, leading to an increase in global temperatures.

20 Easy

20 of 58

Remembering +4 | -1

Pollutant____ forms by burning of fossil fuels.

View answer and explanation

Correct option: D

Sulphur dioxide

Option D is correct because sulfur dioxide (SO2) is a common pollutant formed from the burning of fossil fuels, especially those containing sulfur.

21 Easy

21 of 58

Remembering +4 | -1

Which one of the following is not a common component of classical smog?

View answer and explanation

Correct option: D

{O}_3

Option D (

{O}_3

) is correct because ozone is a component of photochemical smog, not classical smog.

22 Easy

22 of 58

Remembering +4 | -1

Which of the following is/are the main agents of soil erosion?

View answer and explanation

Correct option: A

Wind and water

Option A (Wind and water) is correct because wind and water are the primary agents responsible for soil erosion.

23 Easy

23 of 58

Remembering +4 | -1

Identify the correct decreasing order of the following with respect to altitude from atmosphere.

I. Troposhere

II. Mesopshere

III. Thermosphere

View answer and explanation

Correct option: B

III, II, I

Option B (III, II, I) is correct because the correct order of atmospheric layers from highest to lowest altitude is Thermosphere, Mesosphere, and Troposphere.

24 Easy

24 of 58

Remembering +4 | -1

Methane gas produces by_____ fields.

View answer and explanation

Correct option: B

Paddy field

Option B (Paddy field) is correct because paddy fields are known to produce methane gas due to anaerobic decomposition.

25 Easy

25 of 58

Remembering +4 | -1

Taj Mahal is being slowly disfigured and discoloured. This is primarily due to

View answer and explanation

Correct option: D

acid rain

Option D (acid rain) is correct because acid rain, containing sulfuric and nitric acids, reacts with the calcium carbonate in marble, causing it to dissolve and discolor.

26 Easy

26 of 58

Remembering +4 | -1

DDT and BHC may act as:

View answer and explanation

Correct option: B

Carcinogens

Option B (Carcinogens) is correct because DDT and BHC are known to have carcinogenic properties.

27 Easy

27 of 58

Remembering +4 | -1

The gas that is not considered as a ‘green house gas’ is

View answer and explanation

Correct option: C

{\mathrm{O}_2}

Option C (

{\mathrm{O}_2}

) is correct because oxygen does not significantly absorb infrared radiation and therefore does not contribute to the greenhouse effect.

28 Easy

28 of 58

Remembering +4 | -1

The presence of soluble fluoride ion upto 1 ppm concentration in drinking water, is

View answer and explanation

Correct option: D

Safe for teeth

Option D (Safe for teeth) is correct because fluoride ions at a concentration of up to 1 ppm in drinking water are beneficial for dental health.

29 Easy

29 of 58

Remembering +4 | -1

The size of particulates of

{\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4}

fog lies in the range:

View answer and explanation

Correct option: C

500―1000 nm

Option C (500―1000 nm) is correct because the size of particulates of

{\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4}

fog lies in the range of 500-1000 nm.

30 Easy

30 of 58

Remembering +4 | -1

Which of the following is not regarded as a pollutant?

View answer and explanation

Correct option: B

\mathrm{C}{\mathrm{O}_2}

Option B (

CO_2

) is correct because while

CO_2

can contribute to climate change at high concentrations, it is not typically regarded as a pollutant at normal atmospheric levels.

Revision notes and key takeaways

Review ENVIRONMENTAL CHEMISTRY in your textbook or class notes, then use this set to check your understanding.

Key Takeaways

✓ This set contains 58 single-correct-answer MCQs on ENVIRONMENTAL CHEMISTRY.
✓ Try each question before opening its answer. Read the explanation where one is available.
✓ Sign in to save submitted answers. Revisit incorrect answers alongside your textbook or class notes.

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Environmental chemistry practice · Easy

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