Start learning →

WBJEE Molar Conductivity — practice questions

Explore 3 free Molar Conductivity questions in WBJEE Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

Practise Molar Conductivity with Quill →

Molar Conductivity questions and exercises with answers

Showing questions 1–3 of 3.

**Molar conductivity** $\Lambda$ is defined as:Read the answer and worked solution →On dilution, the **molar conductivity** ($\Lambda$) of an electrolyte:Read the answer and worked solution →The molar conductivity of 0.05 M BaCl₂ solution at 25 °C is 223 Ω⁻¹ cm² mol⁻¹. Its conductivity ($\kappa$) is:Read the answer and worked solution →

Worked practice questions

**Molar conductivity** $\Lambda$ is defined as:

  1. $\Lambda = \kappa^2 c$
  2. $\Lambda = c / \kappa$
  3. $\Lambda = \kappa / c$
  4. $\Lambda = \kappa \cdot c$
Show answer and solution

Correct answer: C. $\Lambda = \kappa / c$

Molar conductivity = conductivity divided by molar concentration: $\Lambda = \kappa/c$. In common units, $\Lambda = 1000\,\kappa/c$ when $\kappa$ is in Ω⁻¹ cm⁻¹ and $c$ in mol L⁻¹.

Open this question →

On dilution, the **molar conductivity** ($\Lambda$) of an electrolyte:

  1. Remains the same
  2. Increases (approaches $\Lambda_0$)
  3. Becomes negative
  4. Decreases
Show answer and solution

Correct answer: B. Increases (approaches $\Lambda_0$)

Molar conductivity = conductance per mole of electrolyte. On dilution more ions are produced per mole of electrolyte (more complete dissociation, less inter-ionic interaction) so $\Lambda$ rises and asymptotes to $\Lambda_0$ at infinite dilution.

Open this question →

The molar conductivity of 0.05 M BaCl₂ solution at 25 °C is 223 Ω⁻¹ cm² mol⁻¹. Its conductivity ($\kappa$) is:

  1. $0.223$ Ω⁻¹ cm⁻¹
  2. $4.46 \times 10^{-3}$ Ω⁻¹ cm⁻¹
  3. $0.01115$ Ω⁻¹ cm⁻¹
  4. $1.115$ Ω⁻¹ cm⁻¹
Show answer and solution

Correct answer: C. $0.01115$ Ω⁻¹ cm⁻¹

$\kappa = \Lambda \cdot c / 1000 = (223)(0.05)/1000 = 0.01115$ Ω⁻¹ cm⁻¹.

Open this question →

How to practise

  1. Choose a Molar Conductivity question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

More Chemistry topics

Ideal and Non-Ideal SolutionsIdeal SolutionsNon-Ideal SolutionsReactions in Aqueous SolutionElectrochemistryElectrochemical SeriesCoordination CompoundsSolutions