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Q.

How many charge in faraday’s is required in conversion of 1mole $C r_{2} O_{7}^{- 2}$ in to $C r^{+ 3}$

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a

2

b

6

c

3

d

4

answer is C.

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Detailed Solution

$\begin{array}{l} C r_{2} O_{7}^{- 2} + 14 H^{+} + 6 e^{-} \to 2 C r^{+ 3} + 7 H_{2} O \\ 1 m o l e 6 m o l e \end{array}$

Charge =6F

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How many charge in faraday’s is required in conversion of 1mole Cr2O7−2 in to Cr+3