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Question

Nitrogen cannot be obtained by heating :

A
Pb(N3)2(s)
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B
KNO3(s)
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C
(NH4)2Cr2O7(s)
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D
NH4NO2(s)
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Solution

The correct option is B KNO3(s)
2Pb(N3)2(s)2Pb+3N2

KNO3KNO2+12O2

(NH4)2Cr2O7(s)ΔN2+4H2O+Cr2O3

NH4NO2(s)ΔN2+2H2O

So, nitrogen cannot be obtained by heating KNO3.

Hence option B is correct.

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