Cell constant has unit:

• A. S m⁻¹
• B. m S⁻¹
• C. m⁻¹
• D. m⁻²

The cell constant is a crucial parameter in electrochemistry, particularly in the measurement of conductivity. It is defined as the ratio of the distance between the electrodes to the area of the electrodes.

Understanding the Units

The unit of the cell constant is derived from its definition. It can be expressed as:

• Distance (meters, m) divided by Area (square meters, m²)

Calculating the Cell Constant

This gives us the unit:

• Cell Constant = Distance / Area = m / m² = m⁻¹

Final Answer

Therefore, the correct unit for the cell constant is m⁻¹, which corresponds to option C.