Given below are two statements: Statement I : The limiting molar conductivity of KCl (strong electrolyte) is…

Given below are two statements:
Statement I : The limiting molar conductivity of KCl (strong electrolyte) is higher compared to that of $\mathrm{CH}_{3} \mathrm{COOH}$ (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:

  1. Statement I is false but Statement II is true
  2. Both Statement I and Statement II are true
  3. Statement I is true but Statement II is false
  4. Both Statement I and Statement II are false

Solution

lon K+ Cl- CH3COO- H+
λ∘/ S cm2 mol-1 73.5 76.3 40.9 349.6

λ∘MCH3COOH=λ∘MH++λ∘MCH3COO−

=349.6+40.9=390.5Scm2mol−1

λ∘M(KCl)=λ∘MK++λ∘MCl−

=73.5+76.3=149.8Scm2mol−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.

Asked in: JEE Main 2021 (26 Aug Shift 1)

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