Metal oxides which decomposes on heating is

Z n O

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A l_{2} O_{3}

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C u O

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H g O

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Solution

The correct option is D $H g O$
Mercury (II) upon heating gives the mercury with the liberation of oxygen gas.
$2 H g O Δ - \to 2 H g + O_{2}$

Other oxides require a very high temperature (since they are inert) to decompose or they do not decompose at normal temperatures.

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

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