Chemistry Class-11: Chapter –14. Environmental Chemistry Part – 2

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Question: 10

The pollutants which come directly in the air from sources are called primary pollutants. Primary pollutants are sometimes converted into secondary pollutants. Which of the following belongs to secondary air pollutants?


(ii) Hydrocarbon

(iii) Peroxyacetyl nitrate


Answer: (iii)

Question: 11

Which of the following statements is correct?

(i) Ozone hole is a hole formed in stratosphere from which ozone oozes out.

(ii) Ozone hole is a hole formed in the troposphere from which ozone oozes out.

(iii) Ozone hole is thinning of ozone layer of stratosphere at some places.

(iv) Ozone hole means vanishing of ozone layer around the earth completely.

Answer: (iii)

Question: 12

Which of the following practices will not come under green chemistry?

(i) If possible, making use of soap made of vegetable oils instead of using synthetic detergents.

(ii) Using for bleaching purpose instead of using chlorine based bleaching agents.

(iii) Using bicycle for travelling small distances instead of using petrol/ diesel based vehicles.

(iv) Using plastic cans for neatly storing substances.

Answer: (iv)

II. Multiple Choice Questions (Type-II)

In the following questions two or more options may be correct.

Question: 13

Which of the following conditions shows the polluted environment?

(i) pH of rain water is .

(ii) amount of carbondioxide in the atmosphere is .

(iii) biochemical oxygen demand 10 ppm.

(iv) eutrophication.

Answer: (iii). (iv)

Question: 14

Phosphate containing fertilisers cause water pollution. Addition of such compounds in water bodies causes __________.

(i) Enhanced growth of algae

(ii) Decrease in amount of dissolved oxygen in water

(iii) Deposition of calcium phosphate

(iv) Increase in fish population

Answer: (i), (ii)

Question: 15

The acids present in acid rain are _________.

(i) Peroxyacetylnitrate




Answer: (ii), (iii), (iv)

Question: 16

The consequences of global warming may be _________.

(i) increase in average temperature of the earth

(ii) melting of Himalayan Glaciers

(iii) increased biochemical oxygen demand

(iv) eutrophication

Answer: (i), (ii)

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