How many faradays are needed to reduce $2$ gram-mole of $C u^{2 +}$ to $C u$ metal?

2 f a r a d a y

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4 f a r a d a y

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6 f a r a d a y

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8 f a r a d a y

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Solution

The correct option is C $4 f a r a d a y$ .
$C u^{2 +}$ + $2$ $e^{-}$ $\to$ $C u$
$1$ mole of $C u^{2 +}$ require $2$ faraday of current
and for $2$ mole we require current$
$= 2 * 2 = 4$ faraday

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