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Q. Carbonic acid is a

The p-Block Elements

Solution:

Carbon dioxide on reaction with water gives a weak dibasic acid called carbonic acid which dissociates as
$H_2CO_3(aq) + H_2O(l)\rightleftharpoons HCO_3^-(aq) + H_3O^+(aq)$
$HCO_3^-(aq) + H_2O(l) \rightleftharpoons CO_3^{2-}(aq) + H_3O^+(aq)$
It is called dibasic because it has two hydrogen ions to donate to a base in an acid base reaction