Find the number of metal oxides which are decomposed on normal heating from the given oxides :
( $N a_{2} O, A l_{2} O_{3}, P b O, A g_{2} O, H g O$ )

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Solution

Two metal oxides $A g_{2} O$ and $H g O$ are decomposed on normal heating.
$2 A g_{2} O Δ - \to 4 A g + O_{2}$
$2 H g O Δ - \to 2 H g + O_{2}$
$N a_{2} O$ , $A l_{2} O_{3}$ and $P b O$ do not decompose on normal heating.

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