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

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Chemistry

Solution Stoichiometry

Question

Given below are two statements :

Statement-I : The limiting molar conductivity of KCl (strong electrolyte) is higher compared to that of CH₃COOH (weak electrolyte).

Statement-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:

Both Statement-I and Statement-II are true

Statement-I is false but Statement-II is true

Both Statement-I and Statement-II are false

Statement-I is true but Statement-II is false

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ion	K⁺	Cl^–	CH₃COO^–	H⁺
λº(S cm²mol^–1)	73.5	76.9	40.9	349.6

λº_M(CH₃COOH) = λº_M(H⁺) + λº_M(CH₃COO^–) = 349.6 + 40.9 = 390.5 S cm²mol^–1

λº_M(KCl) = λº_M(K⁺) + λº_M(Cl^–) = 73.5 + 76.3 = 149.8 S cm²mol^–1

So, statement-I is false.

For an electrolyte the dilution increases (or) decrease in concentration, the number of ions increases due to increase of degree of dissociation. So, the molar conductance increases. Hence Statement-II is false.

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