Question

A standard galvanic cell is constructed in which a Pb²⁺ | Pb half cell acts as the cathode. Which of the following statements are correct?

Hint: Refer to a table of standard reduction potentials.

(Choose all that apply.)

The cathode reaction is Pb²⁺ + 2e^- -> Pb

The anode compartment could be Cl₂|Cl^-.

In the external circuit, electrons flow from the other compartment to the Pb²⁺|Pb compartment.

Pb is oxidized at the cathode.

Pb²⁺ is reduced at the cathode.

Answer 1

1) The cathode reaction is Pb ²⁺ + 2 e^- -> Pb  

TRUE

At cathode, reduction reaction take place i e electrons are gained by chemical species.

2) The anode compartment could be Cl ₂|Cl-.

FALSE

We know the significance of electrode potential that element having more positive value of reduction potential V will easily undergoes reduction.

If we compare reduction potentials of Pb and Cl ₂ , Cl ₂ has higher value so it will act as a cathode not as a anode.

3) In the external circuit, electrons flow from the other compartment to the Pb ²⁺|Pb compartment.

TRUE

Electron flows from anode compartment to cathode compartment through external circuit.

4) Pb is oxidized at the cathode

FALSE

Pb is reduced at cathode

5) Pb ²⁺ is reduced at the cathode

TRUE