Question

a coloured salt which on heating leaves behind a coloured residue evolves a coloured gas acidic to litmus and a coloured gas neutral to litmus
a: Zn(NO3)2
b: Pb(NO3)2
c: CuCO3
d: Cu(NO3)2
e: (NH4)2Cr2O7​

Answer 1

Answer:

d: Cu(NO3)2

Explanation:

because i never heard that salt till now