Question

The cell constant of a conductivity cell _____________.

• A. changes with the change of electrolyte
• B. changes with the change of concentration of electrolyte
• C. changes with the temperature of the electrolyte
• D. remains constant for a cell

Answer 1

The correct option is D

remains constant for a cell

Explanation of the correct option:

Option D:

Cell constant (K) is given by the ratio of the distance between electrodes to the area of the cross-section of the electrodes.

That is, $K=\frac{l}{A}$

1. We can observe from the formula depends only on the distance between the electrodes and their areas.
2. Not on the nature of the electrolyte used.
3. Hence, this is the correct option.

Explanation of the incorrect options:

Option A:

1. We can observe from the formula that the cell constant does not depend on the electrolyte.
2. Therefore, a change in electrolytes does not make any difference.
3. Hence, this option is incorrect.

Option B:

1. The formula that the cell constant does not depend on the electrolyte.
2. Therefore, a change in the concentration of the electrolyte does not make any difference.
3. Hence, this option is incorrect.

Option C:

1. It can also be observed from the formula that the cell constant does not depend on the electrolyte.
2. Therefore, a change in the temperature of electrolytes does not make any difference.
3. Hence, this option is incorrect.

Hence, option D is the correct option.