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

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

(i) \text {Cr(VI)} is more stable than \text {Mo(VI)} and \text {W(VI)}.

(ii) \text {Mo(VI)} and \text {W(VI)} are more stable than \text {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.

 

Answers (1)

The answer is the option (ii, iii) In d-block elements heavier elements exhibit higher oxidation states in their stable form. Like in group 6, \text {Mo(VI)} and \text {W(VI)} are more stable than \text {Cr(VI)}. This is why, in the form of dichromate \text {Cr(VI)} is a stronger oxidizing agent in acidic medium whereas \text {Mo(VI)} in \text {MoO}_{3} and \text {W(VI)} in \text {WO}_{3} are not.

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