Which one of the following compounds gives oxygen on heating?

Z n O

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C u O

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{A l}_{2} O_{3}

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H g O

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Solution

The correct option is D $H g O$
$2 H g O h e a t - - \to 2 H g + O_{2}$
Reddish Mercuric oxide(II) solid is decomposed upon heating into silver liquid mercury and colourless oxygen gas.
Since it is a decomposition reaction it breaks down the oxide into oxygen and the metal.

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Which of the following compounds does not give oxygen on heating ?

All of the following decompose easily on heating and gives O₂except:

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