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Question

Which of the following metal oxide(s) gives metal and oxygen on heating?

A
NaNO3
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B
KNO3
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C
Hg(NO3)2
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D
AgNO3
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Solution

The correct options are
C Hg(NO3)2
D AgNO3
When silver nitrate is heated, silver metal is obtained along with nitrogen and oxygen.
AgNO3ΔAg+12O2+N2

When mercuric nitrate is heated, mercury metal is obtained along with nitrogen and oxygen.
Hg(NO3)2ΔHg+O2+2NO2

Nitrites of sodium and potassium decompose to give nitrites and oxygen.

NaNO3NaNO2+O2

KNO3KNO2+O2

Hence, option C and D are correct.

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