$N O_{2}$ can not be obtained by heating :

K N O_{3}

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P b (N O_{3})_{2}

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C u (N O_{3})_{2}

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

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Solution

The correct option is A $K N O_{3}$
Alkali metal nitrates, except lithium, decompose upon strong heating to give oxygen gas and a metal nitrite.

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

$N O_{2}$ is not obtained in above reaction.

$P b (N O_{3})_{2} \to P b O + 2 N O_{2} + O_{2}$
$C u (N O_{3})_{2} \to C u O + + 2 N O_{2} + O_{2}$
$H g (N O_{3})_{2} \to H r O + 2 N O_{2} + O_{2}$

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