Assertion (A) : The pH of acid rain is less than 5.6.
Reason (R) : Carbon dioxide present in the atmosphere dissolves in rain water and forms carbonic acid.
(i) Both A and R are correct and R is the correct explanation of A.
(ii) Both A and R are correct but R is not the correct explanation of A.
(iii) Both A and R are not correct.
(iv) A is not correct but R is correct.

Answers (1)

The answer is the option (ii) Both A and R are correct, but r is not the correct explanation of A.

Explanation: Normally, the pH of rainwater is 5.6 due to the presence of H+ ions produced due to the dissolution of CO_2 in rainwater. If the pH drops below 5.6, it is known as acid rain.

H_2O(l) + CO_2(g) \rightarrow H_2CO_3(aq)

H_2CO_3(aq) + H^{+}(aq) \rightarrow HCO_{3}^{-}(aq)

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