The incorrect statement(s) among (a) - (c) is (are) [JEE Main-2020 ...

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The incorrect statement(s) among (a) - (c) is (are)
[JEE Main-2020 (September)]
\( \mathrm{P} \)
(a) W(VI) is more stable than \( \mathrm{Cr}(\mathrm{VI}) \).
(b) In the presence of \( \mathrm{HCl} \), permanganate titrations
W 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
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