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.
Q. Water soluble salt (x) was heated into three products A, B and C and B and C are two different paramagnetiic gases. A is red in hot condition, then salt (x) is:

Options

A. `Hg(NO_(3))_(2)`
B. `FeC_(2)O_(4)`
C. `ZnSO_(4)`
D. `Pb(NO_(3))_(2)`

Answer

D

Explanation

`impliesPb(NO_(3))_(2) overset(Delta)to underset("red in hot (Litharge)")(PbO)+underset("Two different paramagnetic gases")ubrace(2NO_(2)uarr+(1)/(2))O_(3)`
`implies Hg(NO_(3))_(2)overset(Delta)toHg+2NO_(2)uarr+O_(2)uarr`
`implies FeC_(2)O_(4)overset(Delta)to FeO+CO uarr+CO_(2)uarr`
`implies ZnSO_(4) overset(gt800^@C)to ZnO+SO_(2)uarr+(1)/(2)O_(2)uarr`