The metal oxide which decomposes on heating is:

Z n O

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H g O

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A l_{2} O_{3}

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C u O

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Solution

The correct option is B $H g O$
Only $H g O$ decomposes upon heating to give $H g$ and $O_{2}$ oxygen gas, other oxides requires very high temperature (since they are inert) to decompose or they do not decompose at normal temperature.

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N a_{2} O, A l_{2} O_{3}, P b O, A g_{2} O, H g O

Given that,

$Z n + \frac{1}{2} O_{2} \to Z n O + 35.25 K J$

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