s-Block ElementsHard

Question

Which of the following salts on heating gives a mixture of two gases ?

Options

A.Ba(NO3)2
B.NaNO3
C.KNO3
D.RbNO3

Solution

Ba(NO3)2 BaO + 2NO2 + O2 ; Alkali metal nitrates gives only O2 gas.
Alkali metal nitrates give only O2 on heating below 500ºC according to following reaction,
MNO3 → MNO2 + O2

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