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

N a N O_{3}

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K N O_{3}

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H g (N O_{3})_{2}

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A g N O_{3}

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Solution

The correct options are
C $H g (N O_{3})_{2}$
D $A g N O_{3}$
When silver nitrate is heated, silver metal is obtained along with nitrogen and oxygen.
$A g N O_{3} Δ \to A g + \frac{1}{2} O_{2} + N_{2}$

When mercuric nitrate is heated, mercury metal is obtained along with nitrogen and oxygen.
$H g (N O_{3})_{2} Δ \to H g + O_{2} + 2 N O_{2}$

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

$N a N O_{3} \to N a N O_{2} + O_{2}$

$K N O_{3} \to K N O_{2} + O_{2}$

Hence, option C and D are correct.

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