question_answer

In the form of dichromate, Cr (VI) is a strong oxidising agent in acidic medium but Mo (VI) in \[Mo{{O}_{3}}\] and W (VI) in\[W{{O}_{3}}\]are not because\[\_\_\_\_\_\_\_\_.\]

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

(u) 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.

A) (i) and (ii)          

B)        (ii) and (iii)

C) (i) and (iv)         

D)        (ii) and (iv)