Question

The number of Faradays required to reduce one mol of Cu²⁺ to metallic copper is ______.

Options

• one

• two

• three

• four

Answer 1

The number of Faradays required to reduce one mol of Cu²⁺ to metallic copper is two.

Explanation:

The reduction of Cu²⁺ to Cu involves a gain of 2 electrons.

\[\ce{Cu^2+ + 2e- -> Cu}\]

Since 1 Faraday supplies 1 mole of electrons, 2 Faradays are required to supply the 2 moles of electrons needed to reduce 1 mole of Cu²⁺ to Cu metal.