Question
Chemistry Question on p -Block Elements
By thermal decomposition of which of the following compound very pure dinitrogen gas can be obtained?
A
Ammonium dichromate
B
Ammonium chloride
C
Sodium Azide
D
Barium Nitrate
Answer
Ammonium dichromate
Explanation
Solution
The correct answer is option (A): Ammonium dichromate
Ammonium dichromate can give pure nitrogen on thermal decomposition. The chemical reaction for the same is
(NH4)2Cr2O7 (s) → Cr2O3(s) + N2(g)+4H2O
This is an exothermic reaction and it causes rapid evolution of gas and resembles a volcanic eruption.