Question

# Although metals form basic oxides, which of the following metals form an amphoteric oxide?

A

$\mathrm{Na}$

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B

$\mathrm{Ca}$

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C

$\mathrm{Al}$

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D

$\mathrm{Cu}$

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Solution

## The correct option is C $\mathrm{Al}$Metals form basic oxides and non-metals form acidic oxides. But few metal oxides show acidic as well as basic behaviour. Amphoteric oxide: An amphoteric oxide is an oxide that can act as an acid or as a base. Examples are aluminium oxide $\left({\mathrm{Al}}_{2}{\mathrm{O}}_{3}\right)$ and zinc oxide $\left(\mathrm{ZnO}\right)$. The amphoteric behaviour of ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ can be seen in the reactions given below. When it reacts with a base, it acts as an acid and vice-versa. ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}+6\mathrm{HCl}\stackrel{}{\to }2{\mathrm{AlCl}}_{3}+3{\mathrm{H}}_{2}\mathrm{O}\phantom{\rule{0ex}{0ex}}\left(\mathrm{base}\right)\left(\mathrm{acid}\right)\left(\mathrm{salt}\right)\left(\mathrm{water}\right)$ ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}+2\mathrm{NaOH}\stackrel{}{\to }2{\mathrm{NaAlO}}_{2}+{\mathrm{H}}_{2}\mathrm{O}\phantom{\rule{0ex}{0ex}}\left(\mathrm{acid}\right)\left(\mathrm{base}\right)\left(\mathrm{salt}\right)\left(\mathrm{water}\right)$Hence, the correct option is (C).

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