Question:
Two statements, one Assertion and the other Reason are given. Choose the correct option.
Assertion: For strong electrolytes, the plot of Molar conductivity versus Concentration gives a straight line with slope equal to +A and intercept equal to \( \lambda_m \).
Reason: For strong electrolytes, \( \lambda_m \) increases slowly with dilution due to an increase in the distance between the ions and increase in ionic mobility.
Two statements, one Assertion and the other Reason are given. Choose the correct option.
Assertion: For strong electrolytes, the plot of Molar conductivity versus Concentration gives a straight line with slope equal to +A and intercept equal to \( \lambda_m \).
Reason: For strong electrolytes, \( \lambda_m \) increases slowly with dilution due to an increase in the distance between the ions and increase in ionic mobility.
Reason: For strong electrolytes, \( \lambda_m \) increases slowly with dilution due to an increase in the distance between the ions and increase in ionic mobility.
Show Hint
For strong electrolytes, molar conductivity increases with dilution due to increased ionic mobility. However, the plot of \( \lambda_m \) versus concentration for strong electrolytes is not a straight line.
Updated On: May 5, 2026
- Assertion is correct but Reason is incorrect.
- Both Assertion and Reason are incorrect.
- Assertion is incorrect but Reason is correct.
- Both Assertion and Reason are correct.
Show Solution
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The Correct Option is C
Solution and Explanation
Step 1: Analyze the Assertion.
The assertion states that for strong electrolytes, the plot of molar conductivity (\( \lambda_m \)) versus concentration gives a straight line with a slope equal to +A and an intercept equal to \( \lambda_m \). This is incorrect.
For strong electrolytes, the plot of \( \lambda_m \) vs concentration is not typically a straight line but rather a curve that shows a decrease in conductivity with increasing concentration. The molar conductivity decreases because the ions are closer together, leading to increased ion-ion interactions, which slows down their movement.
Step 2: Analyze the Reason.
The reason provided is correct. As the solution of a strong electrolyte is diluted, the distance between the ions increases, and their ionic mobility increases. This leads to an increase in the molar conductivity (\( \lambda_m \)) as the ions move more freely when the solution is diluted.
Step 3: Conclusion.
Thus, the assertion is incorrect, but the reason is correct. Therefore, the correct answer is option (C).
The assertion states that for strong electrolytes, the plot of molar conductivity (\( \lambda_m \)) versus concentration gives a straight line with a slope equal to +A and an intercept equal to \( \lambda_m \). This is incorrect.
For strong electrolytes, the plot of \( \lambda_m \) vs concentration is not typically a straight line but rather a curve that shows a decrease in conductivity with increasing concentration. The molar conductivity decreases because the ions are closer together, leading to increased ion-ion interactions, which slows down their movement.
Step 2: Analyze the Reason.
The reason provided is correct. As the solution of a strong electrolyte is diluted, the distance between the ions increases, and their ionic mobility increases. This leads to an increase in the molar conductivity (\( \lambda_m \)) as the ions move more freely when the solution is diluted.
Step 3: Conclusion.
Thus, the assertion is incorrect, but the reason is correct. Therefore, the correct answer is option (C).
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