Calculate the quantity of electricity needed in coulombs to reduce one centimole of dichromate in acid medium, to chromic state

5790

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5780

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5770

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5760

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Solution

The correct option is A 5790
$R e a c t i o n :$

$C r_{_{2}} O_{7}^{- 2} + 14 H^{+} + 6 e^{-} \to 2 C r^{3 +} + 7 H_{2} O$ $(∴ n = 6)$

$Required charge = n \times F$

As we know, $F = 96500 C$ and In centimole $F = 965 C$

Now,

Required Charge = $6 \times 965$ $\Rightarrow$ $5790 C$

Hence, option A is correct.

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Similar questions

What is the quantity of electricity in coulombs needed to reduce 1 mol of

? Consider the reaction:

C r_{2} O_{7}^{2 -} + 14 H^{+} + 6 e^{-}

\to

2 C r^{3 +} + 7 H_{2} O

C r_{2} O_{7}^{2 -}

C r_{2} O_{7}^{2 -} + 14 H^{+} + 6 e^{-} \to 2 C r^{3 +} + 7 H_{2} O

C r_{2} O_{7}^{2 -}

1

C r_{2} O_{7}^{2 -}

H_{2} O_{2}

1

K M n O_{4}

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