Practicing Success

Target Exam

CUET

Subject

Chemistry

Chapter

Physical: Solutions

Question:

Solution I containing 1 g urea in 100 g of solution and Solution II contains 2 g of glucose in 100 g of solution. Which is the correct statement out of the following?

Options:

Boiling point of Solution I will be less than Solution II.

Freezing point of Solution I will be lower than Solution II.

Both will have same freezing point and boiling point.

Osmotic pressure of Solution I will be less than Solution II

Correct Answer:

Freezing point of Solution I will be lower than Solution II.

Explanation:

Colligative properties depend upon molal concentration.

Moles of urea = \(\frac{1}{60}\)

Mass of solvent = 100 - 1 = 99 g

Moles of glucose = \(\frac{2}{180}\)

Mass of solvent = 100 - 2 = 98 g

Molality of Solution I = \(\frac{1/60}{99}\) x 1000 = 0.168 m

Molality of Solution II = \(\frac{2/180}{98}\) x 1000 = 0.113 m

Freezing point of Solution I will be lower than Solution II.