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Given below are two statements: Assertion (A): On dilution, the molar conductivity of a weak electrolyte increases steeply, whereas for a strong electrolyte it increases slowly. Reason (R): On dilution, the degree of dissociation of a weak electrolyte increases, whereas a strong electrolyte remains completely dissociated and only its interionic attractions decrease. In the light of the above statements, choose the co

Options

  1. ABoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)
  2. BBoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
  3. CAssertion (A) is true but Reason (R) is false
  4. DAssertion (A) is false but Reason (R) is true

Correct answer

A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)

Step-by-step solution

Assertion (A) is true. The molar conductivity ( _m ) of weak electrolytes increases steeply on dilution, especially at lower concentrations. For strong electrolytes, the increase is gradual and slow. Reason (R) is true and correctly explains Assertion (A). For a weak electrolyte, dilution increases the degree of dissociation, leading to a larger number of ions in the solution, which causes the steep increase in _m . For a strong electrolyte, it is already completely dissociated at all concentrations; the slow incre

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