How many faradys are required to reduce ...

How many faradys are required to reduce one mole of `Cr_(2)O_(7)^(-2)to Cr^(+3)` ?

A

3F

B

3 coulomb

C

6F

D

`2 xx 6.023 xx 10^(23)e^(-1)`

Verified by Experts

The correct Answer is:

C

`Cr_(2)O_(7)^(-2) rArr 2Cr^(3+)`
Change in O.S. = 6
`therefore` Charge required = 6F

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