Physical Chemistry - Solutions for Competitive Exams

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Physical Chemistry - Solutions

Q. Which of the following solutions has the highest boiling point elevation? (2020)

A. 0.1 M NaCl
B. 0.1 M KCl
C. 0.1 M CaCl2
D. 0.1 M MgCl2

Solution

Boiling point elevation is proportional to the number of particles in solution. CaCl2 dissociates into 3 ions (1 Ca²⁺ and 2 Cl⁻), giving the highest elevation.

Correct Answer: C — 0.1 M CaCl2

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Q. Which of the following statements about solutions is true? (2023)

A. Solutes increase the boiling point of solvents
B. Solutes decrease the freezing point of solvents
C. Both A and B
D. Neither A nor B

Solution

Both statements are true; solutes affect the colligative properties of solvents.

Correct Answer: C — Both A and B

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