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The incorrect statement(s) among (a) - (c) is (are)
(A) W(VI) is more stable than Cr(VI).
(B) In the presence of HCI, permanganate titrations provide satisfactory results.
(C) Some lanthanoid oxides can be used as phosphors.

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(A) only

(B) and (C) only

(B) only

(A) and (B) only

answer is C.

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Detailed Solution

(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 given incorrect results.

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