Question

The quantity of electricity in Faraday needed to reduce $1mol$ of $C{r}_2{O}_7^{2-}$ to $C{r}^{3+}$ is _____

Answer 1

Answer: 6

$\underset{1mol}{C{r}_2{O}_7^{-2}}+\underset{6mol}{6e^{-}}\to 2C{r}^{+3}$
$\Rightarrow$ number of faradays $=$ moles of electrons
$=6$