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The equivalent conductance of NaCl at concentration C and at infinite dilution are λc and λ∞ respectively. The correct relationship between λx and λ∞ is given as: (where the constant B is positive)

1. λc = λ∞ − (B)C
2. λc = λ∞ − (B)√C
3. λc = λ∞ + (B)√C
4. λc = λ∞ + (B)C

Correct answer: λc = λ∞ − (B)√C

Solution

The correct option reflects the principle that as the concentration of an electrolyte like NaCl increases, its equivalent conductance decreases due to ion interactions and reduced mobility, which is captured by the relationship λc = λ∞ − (B)√C, where B is a positive constant.

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