s-Block ElementsHard

Question

Which salt on heating does not give brown coloured gas ?

Options

A.LiNO3
B.KNO3
C.Pb(NO3)2
D.AgNO3

Solution

(A) 2LiNO3   Li2O + 2NO2 ↑ (brown) + O2 ↑
(B) KNO3 KNO2 +  O2 ↑
(C) Pb(NO3)2 PbO + 2NO2 ↑(brown) + O2 ↑
(D) 2AgNO3   2Ag + 2NO2 ↑ (brown) + O2 ↑

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