Which solution has the maximum boiling point?

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(C) The elevation in boiling point is given by $\Delta T_b = i 	imes K_b 	imes m$.Since the concentration $(m)$ is the same ($1\%$ by mass) for all,

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$1\%$ $NaCl$ in water

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(C) The elevation in boiling point is given by $\Delta T_b = i 	imes K_b 	imes m$.Since the concentration $(m)$ is the same ($1\%$ by mass) for all,$\Delta T_b$ depends on the van't Hoff factor $(i)$.For glucose,sucrose,and urea,$i = 1$ (non-electrolytes).For $NaCl$,$i = 2$ (dissociates into $Na^+$ and $Cl^-$).Since $NaCl$ has the highest $i$ value,it will show the maximum elevation in boiling point,resulting in the highest boiling point.

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