In the form of dichromate, \( \mathrm{Cr}(\mathrm{VI}) \) is a stro...

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In the form of dichromate, \( \mathrm{Cr}(\mathrm{VI}) \) is a strong oxidising agent in acidic medium but Mo (VI) in \( \mathrm{MoO}_{3} \) and W (VI) in \( \mathrm{WO}_{3} \) are not because
(i) \( \mathrm{Cr}(\mathrm{VI}) \) is more stable than Mo(VI) and W(VI).
(ii) \( \mathrm{Mo}(\mathrm{VI}) \) and W(VI) are more stable than \( \mathrm{Cr}(\mathrm{VI}) \).
(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.
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