Question

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.

(1) (a) and (b) only 

(2) (a) only 

(3) (b) and (c) only 

(4) (b) only

Answer 1

(4) (b) only

KMnO₄ will not give satisfactory result when it is titrated by HCl.