CUET · CHEMISTRY · PYQ PAPER 2023

The properties which depend on the number of solute particles irrespective of their nature relative to the total number of particles in the solution are called colligative properties. These are relative lowering of vapour pressure of the solvent, depression of freeaing point of the solvent, elevation of boiling point of the solvent and osmotic pressure of the solution. All of these properties help in calculating the observed molar mass of the solute.
Determination of osmotic pressure is considered best for the determination of molecular mass of the solute.
Which ssolution has the highest boiling point ?

A 0.1 m glucose
B 0.5 m glucose
C 1 m glucose
D 2 m glucose

Verified Solution

Answer & Solution

Correct Answer

(D) 2 m glucose

Step-by-step Solution

Detailed explanation

\(\Delta T_b \propto m\) (for non-electrolytes) Higher molality (\(m\)) leads to higher boiling point (\(T_b\)). Comparing molalities: \(2 \,m > 1 \,m > 0.5 \,m > 0.1 \,m\) Solution with highest boiling point: \(2 \,m\) glucose

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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LIST - I	LIST - II
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Choose the correct answer from the options given below

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