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

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.

(A) (a) only
(B) (b) and (c) only
(C) (b) only
(D) (a) and (b) only

Prashant Kotian · Accepted Answer

Correct answer: C. (a) In transition metals on moving down the group higher oxidation states are more stable due to smaller size of atoms, due to lanthanide and actinide contractions. (b) KMnO4 can oxidise chloride into chlorine, so it will give incorrect results (c) its a fact

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