Question

on heating a blue colored powder of copper(II)nitrate in attest tube a black residue of copper oxide is formed along with a colorless gas oxygen and a brown gas X is formed.
write a balanced chemical equation for the reaction identify the brown gas X evolved identified the type of reaction

Answer 1

it will give pop sound and release H2 gas

Answer 2

X is nitrogen
: 2 Cu(NO3)2 → 2 CuO + 4 NO2 + O.