Question

An electrochemical cell can behave like an electrolytic cell when: *

(a) E꜀ₑₗₗ=0

(b) E꜀ₑₗₗ>Eₑₓₜ

(c) Eₑₓₜ>E꜀ₑₗₗ

(d) E꜀ₑₗₗ=Eₑₓₜ​

Answer 1

Answer:

c

Explanation:

C

E

ext

>E

cell

We can study the effect of opposing potential applied to a galvanic cell as follows.

1) When E

external

<1.1V

In a galvanic cell, if an external opposite potential is applied and increased slowly, we find that the reaction continues to take place till the opposing voltage reaches the value 1.1 V.

2) When E

external

=1.1V

When the external voltage is 1.1V the reaction stops altogether and no current flows through the cell.

3) When E

external

>1.1V

Any further increase in the external potential again starts the reaction but in the opposite direction. It now functions as an electrolytic cell, a device for using electrical energy to carry non-spontaneous chemical reactions.

Answer 2

Answer:

An answer is an option (c) $E_{ex_{t}} > E_{ce11}$.

Explanation:

An electrochemical cell is a device that can put together an electrical contemporary from a chemical reaction and use electrical energy to put together a chemical reaction. A device that can use chemical energy to engender electrical energy, or can use electrical energy to cause a chemical reaction is called an electrochemical cell. There are two quintessence of electrochemical cells, viz. galvanic cells, and electrolytic cells.

Hence, the correct answer is option (c) $E_{ex_{t}} > E_{ce11}$.

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