First slide

Transition elements

Question

The number of compounds which on heating gives oxygen as a product
HgO, ${MnO}_{2}, {Pb}_{3} O_{4}, {KMnO}_{4}, K_{2} {Cr}_{2} O_{7}, H_{2} O_{2}, {NH}_{4} {ClO}_{4}, {LiNO}_{3}$

Moderate

Solution

All compounds liberate oxygen. One of the reaction is given as
$H_{2} O_{2} \to H_{2} + O_{2}$

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