1) A standard galvanic cell is constructed with Cu 2+ | Cu + and Ni 2+ | Ni half

Question

1)

A standard galvanic cell is constructed with Cu2+|Cu+ and Ni2+|Ni half cell compartments connected by a salt bridge. Which of the following statements are correct?

Hint: Refer to a table of standard reduction potentials. ( 2 or more may be correct)

(Choose all that apply.)

- Ni is oxidized at the anode.

- As the cell runs, anions will migrate from the Cu2+|Cu+ compartment to the Ni2+|Ni compartment.

- In the external circuit, electrons flow from the Cu2+|Cu+ compartment to the Ni2+|Ni compartment.

- Ni2+ is reduced at the cathode.

- The anode compartment is the Cu2+|Cu+ compartment.

Explanation / Answer

from data table:

Eo(Ni2+/Ni(s)) = -0.250

Eo(Cu2+/Cu+) = 0.159

the electrode with the greater Eo value will be reduced and it will be cathode

here:

cathode is (Cu2+/Cu+)

anode is (Ni2+/Ni(s))

The chemical reaction taking place is

Cu2+(aq) + Ni(s) --> Cu+(aq) + Ni2+ (aq)

- Ni is oxidized at the anode.

True

- As the cell runs, anions will migrate from the Cu2+|Cu+ compartment to the Ni2+|Ni compartment.

True

As more Ni2+ is being formed, Ni2+ will migrate from Ni compartment to Cu compartment and anions will move other way round.

- In the external circuit, electrons flow from the Cu2+|Cu+ compartment to the Ni2+|Ni compartment.

False

since Ni is oxidised, it will loose electron. Electron will flow from Ni compartment to Cu compartment

- Ni2+ is reduced at the cathode.

False

- The anode compartment is the Cu2+|Cu+ compartment.

False

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