Describe the action of heat on the following compounds :
(a) Ammonium nitrate
(b) Ammonium nitrite
( c) Ammonium chloride.
(d) Ammonium dichromate
( e) Orthophosphoric acid
(f) Phosphrous acid
(g) Hypophosphorous acid
(h) Copper nitrate.

Explanation

(a) `NH_4 NO_3 overset (Delta) rarr N_2 O + 2 H_2 O`
(b) `NH_4 NO_2 overset (Delta) rarr N_2 + 2 H_2 O`
( c) `NH_4 Cl rarr NH_3 + HCl`
(d) `(NH_4)_2 Cr_2 O_7 overset (Delta) rarr N_2 + Cr_2 O_3 + 4 H_2 O`
( e) `2 H_3 PO_3 overset (Delta) rarr H_4 P_2 O_7 + H_2 O`
(f) `4H_3 PO_3 overset (Delta)rarr 3 H_3 PO_4 + PH_3`
(g) `2 H_3 PO_2 overset (Delta) rarr H_3 PO_4 + PH_3`
(h) `2 Cu(NO_3)_2 overset (Delta) rarr 2 CuO + 2 NO_2 + O_2`.