Chemistry - Electrochemistry Question with Solution | TestHub

According to the Debye-Hückel-Onsager equation, the variation of molar conductivity ${\Lambda }_m$ with the square root of concentration $\sqrt{c}$ is given by ${\Lambda }_m={\Lambda }_m^{\circ }-A\sqrt{c}$.

This linear relationship with a definite y-intercept (${\Lambda }_m^{\circ }$) is observed only for strong electrolytes.

Weak electrolytes show a steep curve at low concentrations and do not have a linear plot or a well-defined intercept.

Among the given options, ${\text{CH}}_3\text{COOH}$, ${\text{NH}}_4\text{OH}$, and $\text{HCOOH}$ are weak electrolytes.

${\text{CH}}_3\text{COONa}$ is a salt of a weak acid and a strong base, making it a strong electrolyte.

Therefore, ${\text{CH}}_3\text{COONa}$ will show a linear variation with an intercept on the y-axis.

Answer: ${\text{CH}}_3\text{COONa}$