The normal rain water is slightly acidic and its pH value is 5.6 because of which one of the following ? (A) CO2 + H2O H2CO3 (B) N2O5 + H2O 2HNO3 (C) 2SO2 + O2 + 2H2O 2H2SO4 (D) 4NO2 + O2 + 2H2O 4HNO3

Question

The normal rain water is slightly acidic and its pH value is 5.6 because of which one of the following ?

(A) CO2 + H2O H2CO3
(B) N2O5 + H2O 2HNO3
(C) 2SO2 + O2 + 2H2O 2H2SO4
(D) 4NO2 + O2 + 2H2O 4HNO3

Prashant Kotian · Accepted Answer

Correct answer: A. Rain water has pH 5 – 6 due to presence of H+ ion formed by the reaction of rain water with carbon dioxide present in the atmosphere. H2O(l) + CO2(g) ⇌ H2CO3 H2CO3 ⇌ H+ + HCO3

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