Question

Molar conductance ${\wedge }_m$ is plotted against $\sqrt{C}\left(mollitr{e}^{-1}\right)$ for three electrolytes $(NaCl,HCl,N{H}_{4}OH)$.
which of the following is correct?

• A. $\left(1\right)-NaCl,\left(2\right)-HCl,\left(3\right)-N{H}_{4}OH$
• B. $\left(1\right)-HCl,\left(2\right)-NaCl,\left(3\right)-N{H}_{4}OH$
• C. $\left(1\right)-N{H}_{4}OH,\left(2\right)-NaCl,\left(3\right)-HCl$
• D. $\left(1\right)-N{H}_{4}OH,\left(2\right)-HCl,\left(3\right)-NaCl$

Answer 1

Answer: (A)

$\left(1\right)-NaCl,\left(2\right)-HCl,\left(3\right)-N{H}_{4}OH$

$\to$ Line (1) & Line(2) represents plot of $NaCl$ and $HCl$ , as they are strong electrolytes. Strong Electrolyte show linear plot of molar conductance $△m$ vs$\sqrt{C}$.

$\to$ Plot(3) is of weak electrolyte $N{H}_{4}OH$, because for weak electrolyte it is not possible to find maximum molar conductance. Hence, plot of $△m$ vs$\sqrt{C}$ is not linear for weak electrolyte.