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All of the following decompose easily on hea-ting to give O₂ except

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HgO

MnO₂

Pb(NO₃)₂

NaNO₃

answer is B.

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Detailed Solution

O₂ is prepared in the laboratory by thermal decomposition of potassium chlorate in the presence of manganese dioxide as catalyst, decomposition of KMnO₄ and nitrates of alkali metals except Lithium.

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