Question

How many faradays are required to reduce \(1 \mathrm{~mol}\) of \(Cr_{2} O_{7}{ }^{2-}\) to \(\mathrm{Cr}^{3+}\) in acid medium
(A) 2
(B) 3
(C) 5
(D) 6

Answer 1

Ans: (D)
\(1 \mathrm{~mol} \mathrm{Cr}_{2} \mathrm{O}_{7}{ }^{2}\) - requires \(6 \mathrm{~mol}\) electron \(\equiv 6 \mathrm{~F}\) charge
\(\therefore\) Number of Faraday's required \(=6\)

Answer 2

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Answer 3

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