(B) $CO_2$ is an acidic oxide. When it dissolves in water,it forms carbonic acid $(H_2CO_3)$: $CO_2(g) + H_2O(l) \rightleftharpoons H_2CO_3(aq)$. The

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(B) $CO_2$ is an acidic oxide. When it dissolves in water,it forms carbonic acid $(H_2CO_3)$: $CO_2(g) + H_2O(l) \rightleftharpoons H_2CO_3(aq)$. The formation of carbonic acid increases the concentration of $H^+$ ions in the solution. Therefore,the $pH$ of the resulting solution becomes less than $7$.