Which of the following release oxygen on heating at high temperature?

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All of these

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Solution

The correct option is D All of these
Strongly heating Potassium dichromate, Potassium Permanganate or Potassium Chlorate gives oxygen gas.

Heating above $400^{\circ} C$ , the following reactions takes place
$4 K_{2} C r_{2} O_{7} \to 4 K_{2} C r_{2} O_{4} + 2 C r_{2} O_{3} + 3 O_{2}$
$2 K M n O_{4} \to K_{2} M n O_{4} + M n O_{2} + O_{2}$
$2 K C l O_{3} \to 2 K C l + 3 O_{2}$
Thus all of them release oxygen gas on heating above $400^{\circ} C$ . These reactions can be used in the preparation of oxygen gas in laboratory.

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