Question

1 mol of Cu2+ to Cu requires how much charge for the reduction?
a. 289500c
b. 193000c
c. 482500c
d. 422500c​

Answer 1

Given

The reaction :-

${cu}^{2 + } + 2 {e}^{ - } = cu$

To find

Number of electrons involved.

Concept

• Charge on 1 mole of electron is equal to 96,500 C. This is also equal to 1 Faraday = 1 F

Solutions

1 ion of ${cu}^{2 + }$ requires 2 electrons .

=> 1 mole of ${cu}^{2 + }$ requires 2 moles of electrons.

Now, Charge on one moles of electrons = 1 F = 96,500 C.

Thus, charge on 2 F electrons = 2 × 96,500 = 1,93,000 C ans.

Hence , the answer is (b).