How many faradays are required to reduce 1 mole of `Cr_(2)O_(7)^(2-) " to "Cr^(3+)` in acid medium ?

Options

A. 2
B. 3
C. 5
D. 6

Answer

D

Explanation

In acidic medium,
`Cr_(2)O^(7)^(2-) + 14 H^(+) + 6e^(-) rarr 2 Cr^(3+) + 7H_(2)O`
Thus, n=6
Hence 6 F charge is reuqired to reduce 1 moel of `Cr_(2)O_(7)""^(2-) ` to `Cr^(3+)` is acidic medium.