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Assertion:Molar conductivity increases w...

Assertion:Molar conductivity increases with decrease in concentration.
Reason:Conductivity always decrease with decrease in concentration.

A

If both assertion and reason are true and reason is the correct explanation of assertion .

B

If both assertion and reason are true but reason is not the correct explanation of assertion .

C

If assertion is true but reason is false .

D

If both assertion and reason are false .

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason provided. ### Step 1: Understand the Assertion The assertion states that "Molar conductivity increases with decrease in concentration." - Molar conductivity (λm) is defined as the conductivity (κ) of a solution multiplied by 1000 and divided by the molar concentration (C) of the solution: \[ λ_m = \frac{κ \times 1000}{C} \] - As the concentration (C) decreases (i.e., the solution is diluted), the value of λm increases. This is because the number of ions per unit volume increases, which enhances the ability of the solution to conduct electricity. ### Step 2: Understand the Reason The reason states that "Conductivity always decreases with decrease in concentration." - Conductivity (κ) depends on the number of ions present in the solution. When the concentration decreases, the total number of ions in the solution also decreases, leading to a decrease in conductivity. - Therefore, the statement that conductivity decreases with decreasing concentration is correct. ### Step 3: Analyze the Relationship Now, we need to determine if the reason provided is a correct explanation for the assertion. - While both statements are true (molar conductivity increases with dilution, and conductivity decreases with dilution), the reason does not explain the assertion. Molar conductivity increases due to the increase in the effective movement of ions in a larger volume of solvent, whereas conductivity decreases because of the reduced number of ions in the solution. ### Conclusion Based on the analysis: - Both the assertion and the reason are true. - However, the reason is not the correct explanation for the assertion. Thus, the correct answer is option 2: "Both assertion and reason are true, but reason is not the correct explanation of assertion." ---
To solve the question, we need to analyze both the assertion and the reason provided. ### Step 1: Understand the Assertion The assertion states that "Molar conductivity increases with decrease in concentration." - Molar conductivity (λm) is defined as the conductivity (κ) of a solution multiplied by 1000 and divided by the molar concentration (C) of the solution: \[ ...
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