Chemistry Class-11: Chapter – 14. Environmental Chemistry Part – 4 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question: 27

Why does water covered with excessive algal growth become polluted?


Question: 28

A factory was started near a village. Suddenly villagers started feeling the presence of irritating vapours in the village and cases of headache, chest pain, cough, dryness of throat and breathing problems increased. Villagers blamed the emissions from the chimney of the factory for such problems. Explain what could have happened. Give chemical reactions for the support of your explanation.


Question: 29

Oxidation of sulphur dioxide into sulphur trioxide in the absence of a catalyst is a slow process but this oxidation occurs easily in the atmosphere. Explain how does this happen. Give chemical reactions for the conversion of into .


Question: 30

From where does ozone come in the photochemical smog?


Question: 31

How is ozone produced in stratosphere?


Question: 32

Ozone is a gas heavier than air. Why does ozone layer not settle down near the earth?


Question: 33

Some time ago formation of polar stratospheric clouds was reported over Antarctica. Why were these formed? What happens when such clouds break up by warmth of sunlight?


Question: 34

A person was using water supplied by Municipality. Due to shortage of water he started using underground water. He felt laxative effect. What could be the cause?


IV. Matching Type

In the following questions more than one option of Column I and Column II may match.

Question: 35

Match the terms given in Column I with the compounds given in Column II

Match the Terms Given in Column I with the Compounds Given in Column II
Column IColumn II
(i)Acid rain(a)
(ii)Photochemical smog(b)
(iii)Combination with haemoglobin(c)
(iv)Depletion of ozone layer(d)
(e)Unsaturated hydrocarbons


(i) ⇾ (c) , (d) (ii) ⇾ (e) , (d) (iii) ⇾ (b) (iv) ⇾ (a)

Question: 36

Match the pollutant (s) in Column I with the effect (s) in Column II.

Match the Pollutant (S) in Column I with the Effect (S) in Column II
Column IColumn II
(i)Oxides of sulphur(a)Global warming
(ii)Nitrogen dioxide(b)Damage to kidney
(iii)Carbon dioxide(c)‘Blue baby’ syndrome
(iv)Nitrate in drinking water(d)Respiratory diseases
(v)Lead(e)Red haze in traffic and congested areas


(i) ⇾ (d) (ii) ⇾ (e) (iii) ⇾ (a) (iv) ⇾ (c) (v) ⇾ (b)

Question: 37

Match the Pollutant (S) in Column I with the Effect (S) in Column II
Column I (Activity)Column II (Effect)
(i)Releasing gases to the atmosphere after burning waste material containing sulphur(a)Global warming
(ii)Using carbonates as pesticides(b)Photochemical smog, damage to plant life, corrosion to building material, induce breathing problems, water pollution
(iii)Using synthetic detergents for washing clothes(c)Damaging ozone layer
(iv)Releasing gases produced by automobiles and factories in the atmosphere.(d)May cause nerve diseases

in human.

(v)Using chlorofluorocarbon compounds for cleaning computer parts(e)Classical smog, acid rain, water pollution, induce breathing problems, damage to buildings, corrosion of metals.


(i) ⇾ (e) (ii) ⇾ (d) (iii) ⇾ (a) (iv) ⇾ (b) (v) ⇾ (c)

Question: 38

Match the Column I with the Column II
Column IColumn II
(i)Phosphate fertilisers in water(a)BOD level of water increases
(ii)Methane in air(b)Acid rain
(iii)Synthetic detergents in water(c)Global warming
(iv)Nitrogen oxides in air(d)Eutrophication


(i) ⇾ (a) , (d) (ii) ⇾ (c) (iii) ⇾ (a) (iv) ⇾ (b)