Which of the following solution has the highest boiling point?

Question

Which of the following solution has the highest boiling point? (A) 1% glucose (B) 1% NaCI (C) 1% sucrose (D) 1% CaCl2

Tardigrade Admin · Accepted Answer

Elevation in boiling point is colligative property, it depends upon number of ions or molecules or particles.
Glucose and sucrose does not dissociate
so

n = 1

for these solutions while for

N a Cl, n = 2

and for

C a Cl, n = 3.1%

solution means

100 g

solution contains

1 g

solute
(glucose or

N a Cl

or sucrose or

C a Cl) . w_{2} = 1 g, w_{1}

(solvent)

= 99 g

Δ T_{b} = \frac{i \times k _{b} \times W _{2} \times 1000}{M _{2} \times W _{1}}

For glucose.

Δ T_{b} = \frac{1}{180} = 0.0056

(because

k_{b}, w_{2}, w_{1}

same for all the cases)
For sucrose,

Δ T_{b} = \frac{1}{342} = 0.00292

For

N a Cl, Δ T_{b} = \frac{2}{58.5} = 0.0342

For

C a C l_{2}

,

Δ T_{b} = \frac{3}{111} = 0.0270

Hence

1% N a Cl

solution has the highest boiling point.

Q. Which of the following solution has the highest boiling point?

1% glucose

1% NaCI

1% sucrose

1% $C a C l_{2}$

Q. Which of the following solution has the highest boiling point?

1% glucose

1% NaCI

1% sucrose

1% CaCl2​

1% $C a C l_{2}$