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

TestHub · Accepted Answer

(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) $KMnO 4$ can oxidise chloride into chlorine, so it will give incorrect results

(c) its a fact

Chemistry - Complete d-block Question with Solution | TestHub

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