Answer :

Option (i) Cr2O72- (d) +6

By oxidation rule we can calculate the unknown oxidation number.


Cr2O72-


Option (ii) MnO-4 (e) +7


MnO-4


Option (iii) VO-3 (c) +5


VO-3


Option (iv) FeF3-6 (a) +3


FeF3-6


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