In the form of dichromate, Cr(VI) is a strong oxidising agent in acidic medium but Mo(VI) in `Mo0_(3)` and W(VI) in `W0_(3)` are not because

Options

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 satble.

Answer

B, C

Explanation

In d-block elements, for heavier elements, the higher oxidation states are more stable. Hence, Mo(VI) and W(VI) are more stable than Cr (VI). That’s why, Cr (VI) in the form of dichromate is a stronger oxidising agent in acidic medium whereas `MoO_(3)` and `WO_(3)` are not.