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Identify the case(s) where there is chan...

Identify the case(s) where there is change is oxidation number

A

acidified soluton of `CrO_(4)^(2-)`

B

`SO_(2)` gas bubbled through an acidic solution `Cr_(2)O_(7)^(2-)`

C

Alkaline solutoin of `Cr_(2)O_(7)^(2-)`

D

Ammonical solution of `CrO_(4)^(2-)`

Text Solution

Verified by Experts

The correct Answer is:
B
When `SO_(2)` gas bubbled through acidic solution of `Cr_(2)O_(7)^(2-)` it react as follows
In above reaction chromimum changes its oxidation number form +6 to +3 (red) and suplher get oxidised
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