NEETChemistryElectrochemistry
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The limiting molar conductivity of CH ₃ COOH can be calculated using the equation _m^0( CH ₃ COOH ) = _m^0( HCl ) + _m^0( CH ₃ COONa ) - _m^0( NaCl ) . Reason (R): According to Kohlrausch's law, the molar conductivity of an electrolyte at any given concentration can be represented as the sum of the
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
C. (A) is correct but (R) is not correct
Step-by-step solution
Assertion (A) is correct because Kohlrausch's law allows us to determine the limiting molar conductivity of a weak electrolyte (like CH ₃ COOH ) by algebraically combining the limiting molar conductivities of strong electrolytes ( HCl , CH ₃ COONa , and NaCl ) that share its ions. Reason (R) is incorrect because Kohlrausch's law of independent migration of ions is valid only at infinite dilution (limiting molar conductivity, _m^0 ). At any other given concentration, the molar conductivity is not simply the sum of i