How many oxides among the following are basic in nature? $$ \begin{aligned} & \mathrm{As}_2 \mathrm{O}_3,…
How many oxides among the following are basic in nature?
$$
\begin{aligned}
& \mathrm{As}_2 \mathrm{O}_3, \mathrm{Na}_2 \mathrm{O}, \mathrm{MgO}, \mathrm{Mn}_2 \mathrm{O}_3, \mathrm{CaO}, \mathrm{ZnO}, \mathrm{N}_2 \mathrm{O} \text {, } \\
& \mathrm{N}_2 \mathrm{O}_5
\end{aligned}
$$
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Solution
Metal + Oxygen $\longrightarrow$ Metal oxide
Metal oxides are basic in nature. Therefore, $\mathrm{Na}_2 \mathrm{O}$, $\mathrm{MgO}$ and $\mathrm{CaO}$ are basic in nature. $\mathrm{ZnO}$ is amphoteric in nature i.e., it can react with both acids as well as alkalis to form salt.
$
\mathrm{ZnO}+2 \mathrm{HCl} \longrightarrow \mathrm{ZnCl}_2+\mathrm{H}_2 \mathrm{O}
$
$\therefore$ Basic oxides are $\mathrm{Na}_2 \mathrm{O}, \mathrm{MgO}, \mathrm{CaO}, \mathrm{ZnO}$