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  4. The quantity of electricity in Faraday needed to reduce 1 mol of Cr 2 O 72- to Cr 3+ is

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Q. The quantity of electricity in Faraday needed to reduce $1 mol$ of $Cr _{2} O _{7}^{2-}$ to $Cr ^{3+}$ is _____

JEE MainJEE Main 2022Electrochemistry

Solution:

$\underset{1\, mol}{Cr_2O_7^{-2}} + \underset{6 mol}{6e^-} \rightarrow 2Cr^{+3}$
$\Rightarrow$ number of faradays $=$ moles of electrons
$=6$