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Question

Given below are two statements :
Statements I : The limiting molar conductivity of KCl ( strong electrolyte ) is higher compared to that of CH3COOH (weak electrolyte) .

Statements II : Molar conductivity decreases with decrease in concentration of electrolyte
In the light of the above statements, choose the most appropriate answer from the options given below :


A
Both Statements I and II are false
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B
Both Statements I and II are true
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C
Statement I is false but Statement II is true
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D
Statement I is true but Statement II is false
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Solution

The correct option is A Both Statements I and II are false
In aqueous soluiton, H+ exist as H3O+ which is smaller in size than the hydrate ions of K+ and Cl.
Thus, limiting molar conductivity of H+ is very large compare to K+ and Cl. Hence, limiting molar conductivity of CH3COOH is higher than KCl.

Molar conductivity is the conductance property of a solution containing one mole of the electrolyte.
On dilution, the molar conductivity increases.
For strong electrolyte it increases due to decreased ion- ion force of attraction.
For weak electrolyte it increase due to the increase in the degree of dissociation of the electrolyte.

Hence, option (b) is correct.

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