Which oxides will not give metal on heating ?

H g O

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Z n O

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A g_{2} O

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All of these

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Solution

The correct option is B $Z n O$
Metals lying above $H$ in electrochemical series are not obtained from their oxides by heating.

On heating, $Z n O$ will not give $Z n$ metal.

However, it can be reduced with C or hydrogen to give free metal.

$Z n O + C \to Z n + [C O]$

$Z n O + [C O] \to Z n + C O_{2}$

$Z n O + H_{2} a b o v e 400^{0} C - ------ \to Z n + H_{2} O$

However, $H g O$ and $A g_{2} O$ on heating will give $H g$ and $A g$ respectively.

$2 H g O \to 2 H g + O_{2}$

$2 A g_{2} O \to 4 A g + O_{2}$

So, the correct option is $B$

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