####20. When $0.1 mol MnO_4{ }^{2-}$ is oxidised, the quantity of electricity required to completely oxidise $MnO_4^{2-}$ to $MnO_4^{-}$is:
(a) $96500 C$
(b) $2 \times 96500 C$
(c) $9650 C$
(d) $96.50 C$
[2014]
(c)
Quantity of electricity required $=0.1 F$
$ =0.1 \times 96500=9650 C $
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