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Question

NO2 can not be obtained by heating :

A
KNO3
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B
Pb(NO3)2
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C
Cu(NO3)2
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D
Hg(NO3)2
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Solution

The correct option is A KNO3
Alkali metal nitrates, except lithium, decompose upon strong heating to give oxygen gas and a metal nitrite.

2KNO3KNO2+O2

NO2 is not obtained in above reaction.

Pb(NO3)2PbO+2NO2+O2
Cu(NO3)2CuO++2NO2+O2
Hg(NO3)2HrO+2NO2+O2

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