Question

If for a sucrose solution, elevation in boiling point is $0.1^{\circ} C,$ then what will be the boiling point of $NaCl$ solution for same molal concentration?

• A. $0.1^{\circ} C$
• B. $0.2^{\circ} C$
• C. $0.08^{\circ} C$
• D. $0.01 ^{\circ} C$

Answer 1

Answer: (B)

$0.2^{\circ} C$

Answer 2

Elevation in boiling point is a colligative property as it depends upon the number of particles.
$\Delta T_{b} \propto n$
For sucrose, $n=1,\, \Delta T_{b}=0.1^{\circ} C$
For $NaCl,\, n=2,\, \Delta T_{b}=0.2^{\circ} C$