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An oxide of an element is a gas and dissolves in water to give an acidic solution. The element belongs to
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IV group
Carbon element belongs to IVA group.
$\begin{gathered}\mathrm{C}+\mathrm{O}_2 \longrightarrow \mathrm{CO}_2 \\ \mathrm{CO}_2+\mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{H}_2 \mathrm{CO}_3\end{gathered}$
carbonic acid
$\begin{gathered}\mathrm{C}+\mathrm{O}_2 \longrightarrow \mathrm{CO}_2 \\ \mathrm{CO}_2+\mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{H}_2 \mathrm{CO}_3\end{gathered}$
carbonic acid
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