The unit of conductance is:

The correct answer is Option (2) → \(ohm^{-1}\)

Conductance (G) is the reciprocal of resistance (R). Since resistance is measured in ohm, conductance is measured in ohm⁻¹, also called mho; its SI name is the siemens (S):

    \( \displaystyle G = \frac{1}{R} \qquad \text{unit} = \frac{1}{\mathrm{ohm}} = \mathrm{ohm^{-1}} = \mathrm{S} \)

Conductance should not be confused with conductivity (κ), the reciprocal of resistivity, whose unit is ohm⁻¹ cm⁻¹ (S cm⁻¹, or S m⁻¹ in SI units), or with molar conductivity, whose unit is S cm² mol⁻¹.

NCERT (2026-27 edition):
Conductance of Electrolytic Solutions – …

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