Conductivity Cell MCQ Questions and Answers

1. A conductivity cell is mainly used to measure the conductance of which type of solution?

A. An electrolytic solution

B. A pure non-electrolyte solution

C. A suspension of sand in water

D. A gaseous mixture

Correct Answer:
An electrolytic solution

Explanation:
A conductivity cell is used to measure the conductance of electrolytic solutions by means of electrodes dipped into the solution.

2. What is the main purpose of the electrodes in a conductivity cell?

A. To provide a path for electric current through the solution

B. To increase the temperature of the solution

C. To change the colour of the solution

D. To remove ions from the solution

Correct Answer:
To provide a path for electric current through the solution

Explanation:
The electrodes of a conductivity cell allow electric current to pass through the electrolytic solution.

3. The cell constant of a conductivity cell is given by which expression?

A. l/A

B. A/l

C. l × A

D. A + l

Correct Answer:
l/A

Explanation:
The cell constant is the ratio of the distance between the electrodes, l, to the area of cross-section of the electrodes, A.

4. What is the SI unit of the cell constant of a conductivity cell?

A. m⁻¹

B. m

C. S m⁻¹

D. S m

Correct Answer:
m⁻¹

Explanation:
Since the cell constant is l/A, its unit is metre divided by square metre, which is m⁻¹.

5. The cell constant of a conductivity cell is determined by using a solution of known:

A. Conductivity

B. Colour

C. Density

D. Boiling point

Correct Answer:
Conductivity

Explanation:
A solution with known conductivity, commonly a standard KCl solution, is used to determine the cell constant.

6. If the distance between the electrodes of a conductivity cell is increased while their area remains constant, the cell constant will:

A. Increase

B. Decrease

C. Become zero

D. Remain unchanged in all cases

Correct Answer:
Increase

Explanation:
The cell constant is l/A. Therefore, increasing the distance l between the electrodes increases the cell constant when A is constant.

7. If the area of the electrodes is increased while the distance between them remains constant, the cell constant will:

A. Decrease

B. Increase

C. Become infinite

D. Remain unchanged in all cases

Correct Answer:
Decrease

Explanation:
The cell constant is inversely proportional to the electrode area. Thus, increasing the area decreases the cell constant.

8. Which material is commonly used for the electrodes of a conductivity cell?

A. Platinized platinum

B. Wood

C. Plastic

D. Sulfur

Correct Answer:
Platinized platinum

Explanation:
Platinized platinum is commonly used because it is chemically resistant and provides a suitable surface for measuring conductance.

9. The conductivity of a solution is related to its conductance and cell constant by which equation?

A. Conductivity = Conductance × Cell constant

B. Conductivity = Conductance ÷ Cell constant

C. Conductivity = Conductance + Cell constant

D. Conductivity = Cell constant ÷ Conductance

Correct Answer:
Conductivity = Conductance × Cell constant

Explanation:
Conductivity, or specific conductance, is calculated by multiplying the conductance of the solution by the cell constant.

10. Why is a conductivity cell calibrated before measuring the conductivity of an unknown solution?

A. To determine its cell constant

B. To determine the colour of the solution

C. To remove the electrodes from the cell

D. To change the concentration of the solution

Correct Answer:
To determine its cell constant

Explanation:
Calibration with a standard solution determines the cell constant, which is then used to calculate the conductivity of an unknown solution.

chemistry : class12
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chemistry : class12Conductivity Cell : Conductance in electrolytic solutions : Electrochemistry MCQ Questions and Answers

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chemistry : class12
Conductivity Cell : Conductance in electrolytic solutions : Electrochemistry
MCQ Questions and Answers