) is a strong oxidising agent in
acidic medium but Mo (VI) in 
and W() in 
are not because
(a) Cr (VI) is more
stable than Mo(
) 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:
(b, c)
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). Thats why, Cr (VI) in the form
of dichromate is a stronger oxidising agent in acidic medium whereas 
and 
are
not.
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