The compound which gives off oxygen on moderate heating is :

Cupric oxide

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Mercuric oxide

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Zinc oxide

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Aluminium oxide

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Solution

The correct option is B Mercuric oxide
Reaction:
$2 H g O \to 2 H g + O_{2}$ oxygen

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The compound which gives off oxygen on moderate heating is :

The correct option is B Mercuric oxideReaction:2HgO→2Hg+O2 oxygen

The correct option is B Mercuric oxide
Reaction:
$2 H g O \to 2 H g + O_{2}$ oxygen