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JEE Main

Explore popular questions from Environmental Chemistry for JEE Main. This collection covers Environmental Chemistry previous year JEE Main questions hand picked by experienced teachers.

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Q 1. Identify the incorrect statement from the following.

A

Oxides of nitrogen in the atmosphere can cause the depletion of ozone layer

Ozone absorbs infrared radiation

C

Depletion of ozone layer is because of its chemical reactions with chlorofluoroalkanes

D

Ozone absorbs the intense ultraviolet radiation of the sunlight

Explanation

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Q 2. Phosphate pollution is caused by

Sewage and agricultural fertilizers

B

Agricultural fertilizers only

C

Phosphate rocks and sewage

D

Weathering of phosphate rocks only

Explanation

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Q 3. Which one of the following dissolves more rapidly in haemoglobin than oxygen?

A

Ozone

B

{tex} \mathrm { SO } _ { 2 } {/tex}

C

{tex} \mathrm { N } _ { 2 } \mathrm { O } {/tex}

{tex} \mathrm { CO } {/tex}

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Q 4. The greenhouse effect is caused by

A

{tex} \mathrm { CO } {/tex}

B

{tex} \mathrm { NO } _ { 2 } {/tex}

C

{tex} \mathrm { NO } {/tex}

{tex} \mathrm { CO } _ { 2 } {/tex}

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Q 5. Formation of ozone in the upper atmosphere from oxygen takes place by the action of

A

Nitrogen oxides

Ultraviolet rays

C

Cosmic rays

D

Free radicals

Explanation

Stratospheric ozone is formed naturally by chemical reactions involving solar ultraviolet radiation (sunlight) and oxygen molecules, which make up 21% of the atmosphere. In the first step, solar ultraviolet radiation breaks apart one oxygen molecule ({tex}\mathrm{O_2}{/tex}) to produce two oxygen atoms

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Q 6. The chemical entities present in thermosphere of the atmosphere are

{tex} \mathrm { O } ^ { + 2 } , \mathrm { O } ^ { + } , \mathrm { NO } ^ { + } {/tex}

B

{tex} \mathrm { O } _ { 3 } {/tex}

C

{tex} \mathrm { N } _ { 2 } , \mathrm { O } _ { 2 } , \mathrm { CO } _ { 2 } , \mathrm { H } _ { 2 } \mathrm { O } {/tex}

D

{tex} \mathrm { O }_ 3 , \mathrm { O } _ { 2 } ^ { + } , \mathrm { O } _ { 2 } {/tex}

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Q 7. Persistent pesticides such as DDT pass into food chain and increase in amount per unit weight of organism due to their accumulation in fat. This phenomenon is called

biomagnification

B

biodegradation

C

biosynthesis

D

decomposition

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Q 8. Fluorosis, the bone disease, is caused by the presence of:

A

pesticides in water

fluorides in water

C

carbon monoxide in air

D

sulphur dioxide in air

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Q 9. The point of temperature inversion between troposphere and ionosphere is called

A

stratopause

B

mesopause

C

ionopause

tropopause

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Q 10. Which of the following is a primary pollutant?

A

PAN

{tex} \mathrm { CO } {/tex}

C

Aldehydes

D

{tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } {/tex}

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Q 11. Choose the biodegradable pollutant out of the following.

A

DDT

Cow dung

C

Alkyl benzene sulphonate

D

Mercury

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Q 12. The type of pollution caused by spraying of DDT

Air, water, and soil

B

Air and water

C

Air

D

Air and soil

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Q 13. Water pollution is caused by

A

Aeroplanes

B

Fly ash

C

Auto exhaust

Pesticides

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Q 14. Which of the following is not a consequence of greenhouse effect?

A

Climatic conditions will be changed

B

Plants in warmer climates with adequate rainfall would grow faster

C

The incidence of infectious diseases is likely to increase

Malaria will be controlled as the mosquitoes will not survive

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Q 15. What is not correct about greenhouse effect?

A

It results in global warming.

B

{tex} \mathrm { CO } _ { 2 } {/tex} is one of the main chemical species responsible for it.

It results in lowering of levels of ocean over the years.

D

{tex} \mathrm { CH } _ { 4 } , \mathrm { O } _ { 3 } , \mathrm { CFC } {/tex} also contribute to greenhouse effect.

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Q 16. Environmental pollution affects:

A

biotic components

B

human beings only

C

plants only

biotic and abiotic components of environment

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Q 17. Negative soil pollutant is

A

converting fertile land into barren land by dumping ash, sludge, and garbage

B

reduction in soil productivity due to addition of pesticides and industrial wastes

reduction in soil productivity due to erosion and over use

D

None of the above

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Q 18. Which of the following is the coldest region of atmosphere?

A

Thermosphere

B

Troposphere

Mesosphere

D

Stratosphere

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Q 19. The biggest particulate matter is

A

{tex} \mathrm { HNO } _ { 3 } {/tex} droplets

Fly ash

C

{tex} \mathrm { H } _ { 2 } \mathrm { SO } _ { 4 } {/tex} droplets

D

Soot

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Q 20. Which of the following statements about polar stratosphere clouds (PSCs) is not correct?

PSCs do not react with chlorine nitrate and HCl

B

Type I clouds are formed at about {tex} - 77 ^ { \circ } \mathrm { C } {/tex} and contain solid {tex} \mathrm { HNO } _ { 3 }\cdot3 \mathrm { H } _ { 2 } \mathrm { O } {/tex}

C

Type II clouds are formed at about {tex} - 85 ^ { \circ } \mathrm { C } {/tex} and contain some ice

D

A tight whirlpool of wind called polar vortex is formed which surrounds Antarctica

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Q 21. Which forms the part of hazy fumes of photochemical smog?

A

{tex} \mathrm { SO } _ { 2 } {/tex}

B

Aldehydes

C

PAN formation

Nitrogen dioxide