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Question

NO2 is not obtained when following is heated.

A
Pb(NO3)2
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B
AgNO3
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C
Ca(NO3)2
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D
KNO3
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Solution

The correct option is D KNO3
Option (D) is correct.
KNO3 on heating does not produces NO2 while rest of them gives NO2.
Potassium nitrate decomposes on heating, producing potassium oxide and gaseous nitrogen and oxygen.
4KNO32K2O+2N2+5O2

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