Looking for classes? Ksquare Career Institute, Bengaluru →
Kohlrausch's Law states that at :
A
infinite dilution, each ion makes definite contribution to conductance of an electrolyte whatever be the nature of the other ion of the electrolyte
B
infinite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte whatever be the nature of the other ion of the electrolyte
C
finite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte whatever be the nature of the other ion of electrolyte
D
infinite dilution each ion makes definite contribution to equivalent conductance of an electrolyte depending on the nature of the other ion of electrolyte
Detailed Solution
Kohlrausch's law of independent migration of ions: at infinite dilution, when dissociation is complete, each ion makes a definite contribution to the equivalent (molar) conductance of an electrolyte, whatever be the nature of the other ion of the electrolyte.
$\Lambda_m^\infty = \lambda_+^\infty + \lambda_-^\infty$
Here $\lambda_+^\infty$ and $\lambda_-^\infty$ are the ionic conductances at infinite dilution for the cation and the anion respectively.
The law holds only at infinite dilution, because only then are the ions far apart and free from inter-ionic attractions; so the statement with 'finite dilution' is wrong.
The contribution of an ion is independent of the other ion, so the statement 'depending on the nature of the other ion' is wrong.
The contribution is to the equivalent (or molar) conductance, not simply to the conductance.
The law is used to find $\Lambda^\infty$ of weak electrolytes such as acetic acid.
$\Lambda_m^\infty = \lambda_+^\infty + \lambda_-^\infty$
Here $\lambda_+^\infty$ and $\lambda_-^\infty$ are the ionic conductances at infinite dilution for the cation and the anion respectively.
The law holds only at infinite dilution, because only then are the ions far apart and free from inter-ionic attractions; so the statement with 'finite dilution' is wrong.
The contribution of an ion is independent of the other ion, so the statement 'depending on the nature of the other ion' is wrong.
The contribution is to the equivalent (or molar) conductance, not simply to the conductance.
The law is used to find $\Lambda^\infty$ of weak electrolytes such as acetic acid.