Question

what are the amphoteric oxides? give two examples of amphoteric oxides ​

Answer 1

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Many metals (such as copper, zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation states of the oxide. Al2O3 is an example of an amphoteric oxide. Amphoteric oxides also include Lead (II) oxide, and zinc (II) oxide, among many others.

Answer 2

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$\Rightarrow{\sf{An \:amphoteric\: compound\: is \:a}}$$\sf{ molecule\: or \:ion \:that\: can\: react \:both}$$\sf{ as\: an \:acid \:as\: well \:as \:a \:base.}$$\sf{ Many \:metals (such\: as \:copper,}$$\sf{ zinc,\: tin, \:lead,\: \:aluminium,\: and\: beryllium)}$$\sf{ form \:amphoteric\: oxides \:or \:hydroxides.}$$\sf{ Amphoterism\: depends \:on\: the \:oxidation}$$\sf{ state\: of\: the \:oxide.}$

$\sf{Zinc\: oxide\: (ZnO) \:reacts \:with\: both \:acid \:and}$$\sf{with \:bases:}$

$\sf{In \:acid\:: ZnO\:+\:2H\:^{+} }$$\sf{→\:Zn \:^{2+}+\:H_{2}O}$$\sf{In\: base\:: ZnO\:+\:H_{2}O\:+\:2OH \:_{-}\:}$$\sf{ →\:[Zn(OH) _{4}\: ] ^{2−}}$

$\sf{ Aluminium\:Oxide\:-:}$

$\sf{with \:acid\::\:Al _{2}O_{3}\:+\:3H_{2}O+6H_{3}O+(aq)}$$\sf{→2[Al(H _{2}O_{6})^{3}+(aq)}$

$\sf{with \:base\:: \:Al_{2}O_{3}+3H_{2}O+2OH (aq)}$$\sf{→2[Al(OH) _{4} ] ^{-} (aq)}$