# 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.

## Mathematics

Environmental Chemistry

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Q 1. 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 2. Choose the biodegradable pollutant out of the following.

A

DDT

Cow dung

C

Alkyl benzene sulphonate

D

Mercury

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Q 3. Identify the incorrect statement from the following.

A

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

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 4. 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 5. 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 6. 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 7. Formation of ozone in the upper atmosphere from oxygen takes place by the action of

A

Nitrogen oxides

Ultraviolet rays

C

Cosmic rays

D

##### 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 8. 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 9. 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 10. Environmental pollution affects:

A

biotic components

B

human beings only

C

plants only

biotic and abiotic components of environment

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Q 11. 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

C

biosynthesis

D

decomposition

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Q 12. 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 13. 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 14. The point of temperature inversion between troposphere and ionosphere is called

A

stratopause

B

mesopause

C

ionopause

tropopause