# NEET

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

Environmental Chemistry

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Q 1. The substance which is a primary pollutant?

A

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

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

C

{tex} \mathrm { PAN } {/tex}

D

Aldehydes

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Q 2. Which of the following acts as a sink for CO?

A

Plants

B

Haemoglobin

Microorganisms present in the soil

D

Oceans

##### Explanation

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Q 3. Which of the following statements is not true about classical smog?

Its main components are produced by the action of sunlight on emissions of automobiles and factories.

B

Produced in cold and humid climate.

C

It contains compounds of reducing nature.

D

It contains smoke fog and sulphur dioxide.

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Q 4. Which of the following sequence of {tex} \mathrm { T } {/tex} and {tex} \mathrm { F } {/tex} is correct for given statements. Here {tex} \mathrm { T } {/tex} stands for True statement and {tex} \mathrm { F } {/tex} stands for False statement.
(i) Troposphere is the lowest region of atmosphere in which the human beings along with other organisms live.
(ii) Troposphere extends up to the height of {tex} 10 \mathrm { km } {/tex} from sea level.
(iii)Stratosphere lies above troposphere,between {tex} 10\mathrm { km } {/tex} and {tex} 20 \mathrm { km } {/tex} above sea level.
(iv) Troposphere contains much little water vapour, dinitrogen, dioxygen and ozone
(v) Stratosphere contains ozone, and cloud formation also takes place in this region.

A

{tex} \mathrm { TTTTF } {/tex}

B

{tex}\mathrm{TFTFF}{/tex}

{tex}\mathrm{TTFFF}{/tex}

D

{tex}\mathrm{TFTFT}{/tex}

##### Explanation

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Q 5. Green chemistry means such reactions which:

A

produce colour during reactions

reduce use and production of hazardous chemicals

C

are related to the depletion of ozone layer

D

study the reactions in plants

##### Explanation

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Q 6. Photochemical smog consists of excessive amount of {tex}\mathrm{X}{/tex}, in addition to aldehydes, ketones, peroxyacetyl nitrate {tex}\mathrm{(PAN)}{/tex}, and so forth, {tex}\mathrm{X}{/tex} is:

A

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

B

{tex} \mathrm { CH } _ { 4 } {/tex}

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

D

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

##### Explanation

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Q 7. Match the Columns:
{tex} \begin{array} { l l } { \text { Column-I } } & { \text { Column-II } } \\ { \text { A. Oxides of sulphur } } & { \text { I. Global warming } } \\ { \text { B. Nitrogen dioxide } } & { \text {II. Damage to kidney } } \\ { \text { C. Carbon dioxide } } & { \text { III. 'Blue baby' syndrome } } \\ { \text { D. Nitrate in drinking } } & { \text { IV. Respiratory diseases } } \\ { \text { water } } \\ { \text { E Lead } } & { \text {V.Red haze congested areas congested areas } } \end{array} {/tex}

A

{tex}\mathrm{A-V;B-I;C-III;D-IV;E-II}{/tex}

{tex}\mathrm{A-IV;B-V;C-I;D-III;E-II}{/tex}

C

{tex}\mathrm { A - I V; B - I I ; C - I ;D - V ; E - I I I} {/tex}

D

{tex} \mathrm { A } - \mathrm { II } ; \mathrm { B } - \mathrm { IV }; \mathrm { C } - \mathrm { V } ; \mathrm { D } - \mathrm { III } ; \mathrm { E } - \mathrm { I } {/tex}

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Q 8. Which of the following statements are not correct?
(i) {tex} \mathrm { F } ^ { - } {/tex} ion concentration above {tex} 2 \mathrm { ppm } {/tex} causes brown mottling in teeth.
(ii) Excessive {tex} \mathrm { F } ^ { - } {/tex} (over {tex} 10 \mathrm { ppm } {/tex} ) causes harmful effect to bones and teeth.
(iii) Excessive lead in drinking water causes disease methemoglobinemia
(iv) Deficiency of sulphate in drinking water causes laxative effect.

A

(ii) and (iv)

B

(ii) and (iii)

C

(ii), (iii) and (iv)

(iii) and (iv)

##### Explanation

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Q 9. The gas leaked from a storage tank of the Union Carbide plant in Bhopal gas tragedy was:

Methyl isocyanate

B

Methylamine

C

Ammonia

D

Phosgene

##### Explanation

The disaster resulted in a lethal plume of methyl isocyanate (MIC) gas escaping from a storage tank at the Union Carbide pesticide factory in the early hours of December 3, 1984 in the central Indian city of Bhopal. Investigators concluded that water leaked into the tank, causing a reaction that triggered the release.

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Q 10. Minamata disease is due to pollution of

A

aresenic into the atmosphere

B

organic waste into drinking water

C

oil spill in water

industrial waste mercury into fishing water

##### Explanation

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Q 11. Eutrophication causes reduction in

dissolved oxygen

B

nutrients

C

dissolved salts

D

All the above

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Q 12. Which among the following statements is false?

Oil slick in sea water increases D.O. value

B

The main reason for river water pollution is industrial and domestic sewage discharge

C

Surface water contains a lot of organic matter mineral nutrients and radioactive materials

D

Oil spill in sea water causes heavy damage to fishery

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Q 13. The false statement among the followings

The average residence time of {tex}\mathrm{NO}{/tex} is one month.

B

Limestone acts as a sink for {tex} \mathrm { SO } _ { \mathrm { x } } {/tex}

C

{tex} \mathrm { SO } _ { \mathrm { x } } {/tex} can be removed from flue gases by passing through a solution of citrate ions.

D

Ammonia acts as a sink for {tex}\mathrm{NO}_ { \mathrm { x } } {/tex}

##### Explanation

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Q 14. Ozone layer of stratosphere requires protection from indiscriminate use of

A

balloons

B

pesticides

C

atomic explosions

aerosols and high flying jets

##### Explanation

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Q 15. The viable particulate among the following is

A

fumes

algae

C

smoke

D

mist

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Q 16. Match the columns
{tex} \begin{array} { l l } { }{ \text { Column-I } } & { \text { Column-II} } \\ { \text { A. Nitrous oxide } } & { \text { I. Secondary pollutant } } \\ { \text { from car exhausts } } & { \text {II. Combustion of fossil } } \\ { \mathrm { B } \text { . Chlorofluorocarbon } } & { \text { fuels, wood, etc } } \\ { \text { C. Methane } } & { \text { III. Denitrification } } \\ { \text { D. Ozone } \left( \mathrm { O } _ { 3 } \right) } & { \text {IV.Refrigerators,aerosol sprays } } \\ { \mathrm { E.Carbondioxide } } & { \text {V.Cattle,Rice fields,toilets } } \end{array} {/tex}

{tex} \mathrm { A } - \mathrm { III } ; \mathrm { B } - \mathrm { IV } ; \mathrm { C } - \mathrm { V } ; \mathrm { D } - \mathrm { I } ; \mathrm { E } - \mathrm { II } {/tex}

B

{tex}\mathrm{ A - V ; B - I; C - I I I ; D - I V ; E - I I }{/tex}

C

{tex} \mathrm { A } - \mathrm { IV } ; \mathrm { B } - \mathrm { V } ; \mathrm { C } - \mathrm { I } ; \mathrm { D } - \mathrm { II } ; \mathrm { E } - \mathrm { III } {/tex}

D

{tex} \mathrm { A } - \mathrm { I } ; \mathrm { B } - \mathrm { III } ; \mathrm { C } - \mathrm { IV } ; \mathrm { D } - \mathrm { V } ; \mathrm { E } - \mathrm { II } {/tex}

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Q 17. 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 } .3 \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

##### Explanation

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Q 18. Which of the following is/are formed when ozone reacts with the unburnt hydrocarbons in polluted air?
(i) Formaldehyde
(ii) Acrolein
(iii) Peroxyacetyl nitrate
(iv) Formic acid

A

{tex}\mathrm{(i) and (iv)}{/tex}

B

{tex}\mathrm{(ii) only}{/tex}

C

{tex}\mathrm{(iii) only}{/tex}

{tex}\mathrm{(i), (ii) and (iii)}{/tex}

##### Explanation

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Q 19. Use of which of the following solvent in dry cleaning will result in less harm to ground water?

A

{tex} \mathrm { Cl } _ { 2 } \mathrm { C } = \mathrm { CCl } _ { 2 } {/tex}

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

C

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

D

None of these

##### Explanation

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Q 20. The aromatic compounds present as particulates are

polycyclic aromatic hydrocarbons

B

benzene

C

toluene

D

nitrobenzene

##### Explanation

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Q 21. Which of the following statement is false?

London smog is oxidising in nature

B

Photochemical smog causes irritation in eves

C

London smog is a mixture of smoke and fog

D

Photochemical smog results in the formation of PAN

##### Explanation

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Q 22. Excess nitrate in drinking water can cause

methemoglobinemia

B

kidney damage

C

liver damage

D

laxative effect

##### Explanation

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Q 23. Soil is polluted by ,Choose the correct option.
I. pesticides
II. synthetic fertilizers
III. green manure

A

I and III

I and II

C

II and III

D

I, II and III

##### Explanation

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Q 24. Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal?

A

{tex} \mathrm { O } _ { 3 } {/tex} and {tex} \mathrm { CO } _ { 2 } {/tex}

B

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

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

D

{tex} \mathrm { SO } _ { 2 } {/tex} and {tex} \mathrm { O } _ { 3 } {/tex}

##### Explanation

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Q 25. Photochemical smog consists of excessive amount of {tex}\mathrm X , {/tex} in addition to aldehydes, ketones, peroxyacetyl nitrate {tex}\mathrm{(PAN)}{/tex}, and so forth {tex}\mathrm X , {/tex} is:

A

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

B

{tex} \mathrm { CH } _ { 4 } {/tex}

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

D

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