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Solved Examples on Environmental Chemistry:

Question.1 Why does rain water have a pH of about 5 – 6?

Solution:  Normally rain has a pH of about 5 – 6 due to dissolution of  of the atmosphere into it.

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Question.2  Explain giving reasons. ‘The presence of CO reduces the amount of haemoglobin available in the blood for carrying oxygen to the body cells’.

Solution: CO combines with haemoglobin of the red blood corpuscles about 300 times more easily than oxygen to form carboxy haemoglobin reversibly as follows:

Thus it is not able to combine with oxygen to form oxyhaemoglobin and transport of oxygen to different body cell cannot take place.

Question.3 Why is acid rain considered as a threat to ‘Taj Mahal’?

Solution: Taj Mahal is made of marble. The acid rain contains which attacks the marble  thereby pitting it, decolourising it and making it lustreless.

Question. 4 The acid rain does not contain 

(A)  Sulphuric acid            (B)   Nitric acid

(C)  Sulphurous acid          (D)  Acetic acid

Solution: Nitrogen oxides & acidic soots. Sulphurdioxide & nitrogen dioxide interact with water vapours in presence of sunlight to form sulphuric acid & nitric acid units. 

Acid rain contains sulphuric acid, nitric acid, sulphurous acid but does not contain acetic acid.

Hence, the correct option is D.

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