Question:

Which of the following statement is true for aqueous solution of 0.1 M urea, 0.2 M glucose nad 0.3 M sucrose

Updated On: Jun 13, 2025

The elevation in boiling point is the highest for urea.
The vapour pressure and boiling point are the lowest for urea.
The depression in freezing point is the highest for urea.
The vapour pressure and freezing point are the the lowest for urea.

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The Correct Option is B

Solution and Explanation

To solve the problem, we need to determine which statement is true for the aqueous solutions of 0.1 M urea, 0.2 M glucose, and 0.3 M sucrose.

1. Understanding Colligative Properties:
Colligative properties depend on the number of solute particles in a solution, not the type of solute particles. These properties include elevation in boiling point, depression in freezing point, vapor pressure lowering, and osmotic pressure. The more particles that are present in the solution, the more significant the colligative effects.

2. Analyzing the Solutions:
- Urea (0.1 M) does not dissociate into ions, so the number of particles in solution is the same as the molarity.
- Glucose (0.2 M) and sucrose (0.3 M) also do not dissociate, and their molarity represents the number of particles in solution.
Since the depression in freezing point, elevation in boiling point, and vapor pressure lowering are all directly proportional to the concentration of solute particles, solutions with higher concentrations will show more significant effects.

3. Focusing on the Correct Answer:
The statement "The boiling point is the lowest for urea" is true because urea has the lowest concentration (0.1 M). This leads to the smallest effect on the boiling point elevation compared to glucose (0.2 M) and sucrose (0.3 M), which have higher concentrations and thus cause a greater increase in boiling point.

4. Conclusion:
The correct statement is that the boiling point is the lowest for urea, as urea has the lowest molarity and therefore the smallest effect on the boiling point elevation.

Final Answer:
The correct answer is: The boiling point is the lowest for urea.

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Concepts Used:

Biomolecules

Biomolecules are the most essential organic molecules, which are involved in the maintenance and metabolic processes of living organisms. These non-living molecules are the actual foot-soldiers of the battle of sustenance of life.

There are four major classes of Biomolecules – Carbohydrates, Proteins, Nucleic acids and Lipids.

Carbohydrates are chemically defined as polyhydroxy aldehydes or ketones or compounds which produce them on hydrolysis.
Proteins are another class of indispensable biomolecules, which make up around 50per cent of the cellular dry weight. Proteins are polymers of amino acids arranged in the form of polypeptide chains. The structure of proteins is classified as primary, secondary, tertiary and quaternary in some cases.
Nucleic acids refer to the genetic material found in the cell that carries all the hereditary information from parents to progeny. There are two types of nucleic acids namely, deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). The main function of nucleic acid is the transfer of genetic information and synthesis of proteins by processes known as translation and transcription.
Lipids are organic substances that are insoluble in water, soluble in organic solvents, are related to fatty acids and are utilized by the living cell.