Kohlrausch law is related to which of the following term?

Migration of ions

The correct answer is Option (4) → Migration of ions.

Kohlrausch's law is primarily related to the migration of ions in an electrolyte solution. Here's a brief explanation of Kohlrausch's law and its relevance:

Kohlrausch's Law

Kohlrausch's law states that at infinite dilution, the molar conductivity of an electrolyte can be expressed as the sum of the contributions from each of the ions present in the electrolyte. It can be mathematically represented as:

\(\Lambda_m^0 = \nu_+ \lambda^0_+ + \nu_- \lambda^0_-\]

where:

\(\Lambda_m^0\) = limiting molar conductivity of the electrolyte at infinite dilution.

\(\nu_+\) and \(\nu_-\) = the stoichiometric coefficients of the cation and anion, respectively.

\(\lambda^0_+\) and \(\lambda^0_-\) = limiting molar conductivities of the cation and anion, respectively.

Relevance to Migration of Ions

Migration of Ions: The law emphasizes how ions migrate in an electric field and contribute to the conductivity of the solution. As ions move, their individual contributions to conductivity can be determined, leading to the overall conductivity of the electrolyte solution.

Conclusion

Thus, Kohlrausch's law is most closely associated with migration of ions.