NCERT Class 12 Chemistry — Which of the following units is

Q: Which of the following units is used to measure molar conductivity?

The correct option is S cm² mol⁻¹. Molar conductivity ($\Lambdam$) is defined as the conducting power of all the ions produced by dissolving one mole of an electrolyte in V cm³ of solution. Mathematically, $\Lambdam = \frac{\kappa \times 1000}{M}$, where $\kappa$ is conductivity and $M$ is molarity. The SI unit of conductivity is S m⁻¹ and molar conductivity is S m² mol⁻¹, but in chemistry, it is most commonly expressed in S cm² mol⁻¹.

NCERT · Class 12 · Chemistry · ElectrochemistryWhich of the following units is used to measure molar conductivity?

Step-by-Step Solution

The correct option is S cm² mol⁻¹. Molar conductivity ($\Lambda_m$) is defined as the conducting power of all the ions produced by dissolving one mole of an electrolyte in V cm³ of solution. Mathematically, $\Lambda_m = \frac{\kappa \times 1000}{M}$, where $\kappa$ is conductivity and $M$ is molarity. The SI unit of conductivity is S m⁻¹ and molar conductivity is S m² mol⁻¹, but in chemistry, it is most commonly expressed in S cm² mol⁻¹.

Detailed Options Breakdown

Option : S cm⁻¹

Incorrect choice. This distractor represents a common misunderstanding of the core principles of Electrochemistry.

Option 1: S cm² mol⁻¹ (Correct Answer)

Correct choice. Refer to the step-by-step verified solution guidelines above for details.

Option 2: S cm⁻² mol

Incorrect choice. This distractor represents a common misunderstanding of the core principles of Electrochemistry.

Option 3: S⁻¹ cm² mol⁻¹

Incorrect choice. This distractor represents a common misunderstanding of the core principles of Electrochemistry.

💡 Study Guide: This question tests core syllabus concepts from Electrochemistry. For formulas, key summaries, and mock exam reference guides, read the full Electrochemistry Revision Notes.

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