A standard galvanic cell is constructed with Cd2+|Cd and Ni2+|Ni half cell compa

Question

A standard galvanic cell is constructed with Cd2+|Cd and Ni2+|Ni half cell compartments connected by a salt bridge. Which of the following statements are correct? (more than one answer) 1. As the cell runs, anions will migrate from the Cd2+|Cd compartment to the Ni2+|Ni compartment. 2. Cd2+ is reduced at the cathode. 3. Ni2+ is reduced at the cathode. 4. The cathode compartment is the Cd2+|Cd compartment. 5. In the external circuit, electrons flow from the Cd2+|Cd compartment to the Ni2+|Ni compartment

Explanation / Answer

Cd(s) Cd2++ 2e ............ +0.4V

Ni2+ + 2e Ni(s).............-0.25V

so the galvanic cell reaction is .....(for a galvanic cell Eocell >0)

Cd(s) + Ni2+ Cd2+ + Ni(s) ......Eocell=0.15V

Ni2+ is reduced at the cathode

Cd(s) is oxidised at the anode

anions move towards the anode

i.e. towards the Cd2+|Cd compartment

In the external circuit electrons flow from anode to cathode

i.e from the Cd2+|Cd compartment to the Ni2+|Ni compartment

The correct statements are (3) and (5).

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