First slide

Electrochemical cell

Question

Which of the following reaction is possible at anode ?

Easy

A

$\large 2C{r^{3 + }}\, + \,7{H_2}O\, \to \,C{r_2}{O_7}^{2 - }\, + \,14{H^ + }$
B

${F_2}\, \to \,2{F^ - }$
C

$\frac{1}{2}{O_2}\, + \,2{H^ + }\, \to \,{H_2}O$
D

None of these

Solution

Oxidation occurs at anode.
In option 1 Oxidation state of Cr is increasing from   +3 to +6. It is an Oxidation reaction occurs at anode.
In option 2 Oxidation state of F is decreasing from    0 to -1. It is reduction reaction occurs at cathode.
In option 3 Oxidation state of O is decreasing from    0 to -2. It is reduction reaction occurs at cathode.

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