In salts of polyatomic anion, as polarising power of cation increases, thermal stability of the salt decreases and decomposed species may further undergo redox reaction.
A water-soluble salt (x) was heated into three products A, B, and C. B and C are two different paramagnetic gases. A is red in hot condition. What is salt (x)?
a. Hg(NO3)2
b. FeC2O4
c. ZnSO4
d. Pb(NO3)2