The processes of calcination and roasting in metallurgical industries, respectively, can Iead to :

The incorrect statement(s) among (a) - (c) is (are)

(a) W(VI) is more stable than Cr(VI).

(b) In the presence of HCl, permanganate titrations provide satisfactory results.

(c) Some lanthanoid oxides can be used as phosphors.

The process that is NOT endothermic in nature is :

The Crystal Field Stabilization Energy
(CFSE) of [CoF₃(H₂O)₃] ($$\Delta $$₀ < P) is :