Question

The number of Faradays required to reduce one mole of $C{u}^{2+}$ to metallic copper is:

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is B 2

Faraday's first law state that," the amount of current passed through the electrode is directly proportional to the number of substances liberated from it."

The reduction of one mole of $C{u}^{2+}to$Cu$ can be represented as:

$C{u}^{2+}2e^{-}\to Cu$

Since in this reaction, there are two moles of electron involved in this reaction thus the amount of charge required is $2F$.