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Q.

In the form of dichromate, Cr(VI) is a strong oxidizing agent in acidic medium but Mo(VI) in MoO3  and W(VI) in WO3 are not because

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a

Cr(VI) is more stable than Mo(VI) and W(VI)

b

Mo (VI) and W (VI) are more stable than Cr(VI)

c

Higher oxidation states of heavier members of group-6 of transition series are more stable

d

Lower oxidation states of heavier members of group-6 of transition series are more stable.

answer is B.

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Detailed Solution

In d-block the stability of higher oxidation increases are more from 3d to 4d and then to 5d
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In the form of dichromate, Cr(VI) is a strong oxidizing agent in acidic medium but Mo(VI) in MoO3  and W(VI) in WO3 are not because