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Q.

In the conversion of  CrO42- → Cr2O72-  , the oxidation number of oxygen

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a

increases

b

decreases

c

becomes zero

d

remains unchanged

answer is D.

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Detailed Solution

It is given to find out the change in oxidation number of oxygen during the conversion of CrO42-  → Cr2O72-

Oxidation number of oxygen remains unchanged that is -2 on both sides.

Generally, Oxygen shows an oxidation number of -2 except for the peroxides and F2O.

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