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JEE • CHEMISTRY • ENVIRONMENTAL CHEMISTRY

Environmental chemistry practice · Mixed difficulty

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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 135 questions

1 Medium

1 of 135

Understanding +4 | -1

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.

View answer and explanation

Correct option: A

Both Statement I and Statement II are correct.

Option A is correct because both statements accurately describe classical and photochemical smog, respectively.

2 Easy

2 of 135

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.

3 Medium

3 of 135

Remembering +4 | -1

UV radiations bring about

View answer and explanation

Correct option: A

Skin cancer

Option A (Skin cancer) is correct because UV radiation damages DNA in skin cells, leading to an increased risk of skin cancer.

4 Easy

4 of 135

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.

5 Medium

5 of 135

Remembering +4 | -1

Which of the following is a primary pollutant?

View answer and explanation

Correct option: A

CO

Option A (

CO

) is correct because Carbon Monoxide (

CO

) is a primary pollutant, directly emitted from sources.

6 Easy

6 of 135

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.

7 Medium

7 of 135

Remembering +4 | -1

Persons working in cement plants and limestone quarries are more prone to disease like:

View answer and explanation

Correct option: C

Silicosis

Option C (Silicosis) is correct because silicosis is a lung disease caused by inhaling silica dust, which is common in cement plants and limestone quarries.

8 Medium

8 of 135

Remembering +4 | -1

According to recent reports, acid rain is caused by

View answer and explanation

Correct option: B

Excessive release of

\mathrm{NO}_2

and

\mathrm{SO}_2

in atmosphere by burning of fossil fuel.

Option B (Excessive release of

\mathrm{NO}_2

and

\mathrm{SO}_2

in atmosphere by burning of fossil fuel) is correct because acid rain is primarily caused by nitrogen and sulfur oxides released from burning fossil fuels.

9 Medium

9 of 135

Remembering +4 | -1

The BOD value of clean water is

View answer and explanation

Correct option: A

< 5

ppm

Option A (

< 5

ppm) is correct because clean water has a low BOD value, indicating minimal organic pollution.

10 Medium

10 of 135

Remembering +4 | -1

Photochemical smog consists of excessive amount of X, in
addition to aldehydes, ketones, peroxyacetyl nitrate (PAN), and so forth, X is :

View answer and explanation

Correct option: C

{O_3}

Option C (

{O_3}

) is correct because photochemical smog contains ozone (

O_3

) along with other pollutants like aldehydes, ketones, and PAN.

11 Medium

11 of 135

Remembering +4 | -1

Salvarsan is an antimicrobial agent which is used to cure:-

View answer and explanation

Correct option: B

Syphilis

Option B (Syphilis) is correct because Salvarsan, also known as arsphenamine, was historically used to treat syphilis.

12 Easy

12 of 135

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.

13 Easy

13 of 135

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.

14 Easy

14 of 135

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.

15 Easy

15 of 135

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.

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16 Medium

16 of 135

Remembering +4 | -1

Which of the following gases present in air protects life on the earth from the harmful effects of

UV

rays from the sun?

View answer and explanation

Correct option: D

Ozone

Option D (Ozone) is correct because the ozone layer in the atmosphere absorbs harmful UV rays from the sun, protecting life on Earth.

17 Medium

17 of 135

Remembering +4 | -1

The ozone layer forms naturally by

View answer and explanation

Correct option: B

The interaction of UV radiation with oxygen.

Option B (The interaction of UV radiation with oxygen) is correct because UV radiation breaks down oxygen molecules into single oxygen atoms, which then combine with other oxygen molecules to form ozone.

18 Medium

18 of 135

Remembering +4 | -1

The formation of

{O}_3

in upper part of atmosphere is catalyzed by

View answer and explanation

Correct option: B

NO

Option B (

NO

) is correct because nitrogen oxide acts as a catalyst in the formation of ozone in the upper atmosphere.

19 Medium

19 of 135

Understanding +4 | -1

The compound which reacts with ozone very rapidly to liberate oxygen is

View answer and explanation

Correct option: A

{NO}

Option A (

{NO}

) is correct because nitric oxide reacts rapidly with ozone to produce nitrogen dioxide and oxygen.

20 Easy

20 of 135

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.

21 Medium

21 of 135

Remembering +4 | -1

Maximum limit of nitrate in drinking water is ____ ppm and its excess concentration causes ____

View answer and explanation

Correct option: B

50 ppm, blue baby syndrome

Option B (50 ppm, blue baby syndrome) is correct because the maximum limit of nitrate in drinking water is 50 ppm, and exceeding this limit can cause methemoglobinemia, also known as blue baby syndrome.

22 Medium

22 of 135

Remembering +4 | -1

Cause of Stratosphere's ozone layer depletion

View answer and explanation

Correct option: A

\mathrm{CF}_2 \mathrm{Cl}_2

Option A (

\mathrm{CF}_2 \mathrm{Cl}_2

) is correct because chlorofluorocarbons (CFCs) like dichlorodifluoromethane are major contributors to ozone depletion.

23 Easy

23 of 135

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.

24 Medium

24 of 135

Remembering +4 | -1

Which of the following region is the coldest?

View answer and explanation

Correct option: C

Mesosphere

Option C (Mesosphere) is correct because the mesosphere is the coldest layer of the atmosphere, with temperatures reaching as low as -100°C.

25 Easy

25 of 135

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.

26 Medium

26 of 135

Remembering +4 | -1

Which one of the following gases is reported to retard photosynthesis?

View answer and explanation

Correct option: D

N{O_2}

Option D (

N{O_2}

) is correct because nitrogen dioxide damages plant leaves, thus retarding photosynthesis.

27 Medium

27 of 135

Understanding +4 | -1

The correct set of species responsible for the photochemical smog is

View answer and explanation

Correct option: C

NO,N{O_2},{O_3}

and hydrocarbons

Option C (

NO,N{O_2},{O_3}

and hydrocarbons) is correct because these species are directly involved in the photochemical reactions that produce smog.

28 Medium

28 of 135

Remembering +4 | -1

Which of the following is responsible for peeling of ozone umbrella?

View answer and explanation

Correct option: C

\mathrm{CFC}s

Option C (

\mathrm{CFC}s

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

29 Easy

29 of 135

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.

30 Easy

30 of 135

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.

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 135 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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