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In the form of dichromate,

Question:

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

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

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

(iii) Higher oxidation states of heavier members of group-6 of transition

series are more stable.

(iv) Lower oxidation states of heavier members of group-6 of transition series

are more stable.

Solution:

Option (ii) and (iii) are the answers.

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