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In the conversion of CrO₄^2- $\to$ Cr₂O₇^2- , the oxidation number of oxygen

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increases

decreases

becomes zero

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 CrO₄^2- $\to$ Cr₂O₇^2-

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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