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

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

Quantrex Academy · Accepted Answer

Correct answer: C. (b) only

(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

The incorrect statement(s) among (a) - (c) is (are) : (a) W ( VI )...

Options

Correct answer

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