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(B) $HCl$ and $NaCl$ are strong electrolytes,so their molar conductivity decreases linearly with $\sqrt{C}$ according to the Debye-$H$ückel-Onsager eq

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$I \ (HCl), II \ (NaCl), III \ (NH_4OH)$

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(B) $HCl$ and $NaCl$ are strong electrolytes,so their molar conductivity decreases linearly with $\sqrt{C}$ according to the Debye-$H$ückel-Onsager equation: $\Lambda_m = \Lambda_m^0 - A\sqrt{C}$.$HCl$ has a higher molar conductivity than $NaCl$ due to the higher ionic mobility of $H^+$ ions compared to $Na^+$ ions.Therefore,curve $I$ corresponds to $HCl$ and curve $II$ corresponds to $NaCl$.$NH_4OH$ is a weak electrolyte,which shows a sharp increase in molar conductivity upon dilution (as $\sqrt{C}$ decreases),represented by curve $III$.

$A$ graph was plotted between molar conductivity of various electrolytes ($NaCl$,$HCl$ and $NH_4OH$) and $\sqrt{C}$ (in $mol \ L^{-1}$). Identify the correct assignment for the curves $I$,$II$,and $III$.

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