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Which amongst the following aqueous solution of electrolytes will have minimum elevation in boiling point? Choose the correct option:-
A
0.05 M NaCl
B
0.1 M KCl
C
0.1 M $MgSO_4$
D
1 M NaCl
Detailed Solution
Boiling point elevation $\propto i\times M$ (van't Hoff factor times molar concentration). Comparing: NaCl (0.05M): $2\times0.05=0.1$; KCl (0.1M): $2\times0.1=0.2$; $MgSO_4$ (0.1M): $2\times0.1=0.2$; NaCl (1M): $2\times1=2$. The minimum value ($i\times M=0.1$) is for 0.05 M NaCl, giving the minimum elevation in boiling point.