Question

Which of the following species gives colourless and odourless gas on thermal decomposition :
(1) (NH4)2Cr2O7
(2) Pb(NO3)2
(3) ZnSO4.7H2O
(4) (NH4)2SO4

Answer 1

Answer:

I think it's option 3

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Answer 2

Answer:

Answer-(1)

(NH4)2 Cr2O7 → N2 + Cr2O3 + H2O in presence of heat.