Oxides of the various metals are converted into metal by heating but not in :

A g_{2} O

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CuO

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HgO

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all are correct

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Solution

The correct option is B CuO
Oxides of various metal oxides are converted into metals on heating but CuO (copper oxide) does not not converted into metal on heating but by reaction with Cu2S.
CuO + Heat $\to$ no reaction
So, answer is B.

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