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  4. A graph of molar conductivity of three electrolytes ( NaCl , HCl . and . NH 4 OH ) is plotted against √ C Which of the following options is correct ?

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Q. A graph of molar conductivity of three electrolytes $\left( NaCl , HCl \right.$ and $\left. NH _{4} OH \right)$ is plotted against $\sqrt{ C }$
Which of the following options is correct ?Chemistry Question Image

Electrochemistry

Solution:

In any graph of molar conductivity vs $\sqrt{ C }$, a weak electrolyte gives a curved decreasing graph strong electrolytes give straight-line decreasing graphs, in which the graph of stronger electrolyte will always be above the graph of the comparatively weaker electrolyte.
In option [B], Graph III is curved and corresponds to $NH _{4} OH$ which is a weak electrolyte. Graph II \& I respectively represent $NaCl$ and $HCl$. $(\because HCl$ is a stronger electrolyte among the two).