# Q.58. Boiling point is least for 1) 0.1 m urea 2) 0.2 m urea 3) 0.1 m NaCl 4) 0.2 m $MgC{l}_{2}$

Dear Student,

Whenever a non-volatile substance is dissolved in a solvent, the boiling point of the solvent increases. The higher the concentration (molality), the higher the boiling point.
NaCl and MgCl2 is ionic solid so it will have more boiling point than non ionic solid.
therefore 0.1 m urea will have least boiling point.
Regards

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