Chapter Exam

Chapter 9: Solutions — Online MCQ Test

Q: Which concentration unit represents the number of moles of solute per kilogram of solvent?

Answer: B. Molality — Molality is defined as the number of moles of solute dissolved in 1 kg of solvent.

Q: In a non-ideal solution, which of the following is true for a positive deviation from Raoult's law?

Answer: C. ΔHmix > 0 — For positive deviation, intermolecular forces are weaker, leading to endothermic mixing (ΔHmix > 0) and expansion in volume (ΔVmix > 0).

Q: A solution contains 1 mole of solute A and 3 moles of solvent B. The mole fraction of solute A is:

Answer: B. 0.25 — Mole fraction of A = moles of A / (moles of A + moles of B) = 1 / (1 + 3) = 1/4 = 0.25.

CHEMISTRY · CLASS 11th · Tamil Nadu State Board

Practice Chapter 9: Solutions with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 11th CHEMISTRY. This chapter covers: Focusing on liquid mixtures this chapter details solution types concentration units Raoult law and ideal non-ideal solutions. Students study colligative properties vapor pressure l.... AI-generated questions from basic to board-exam level, with instant results and explanations.

Questions

20m

Time Limit

Attempts Left

10 random questions from this chapter (mixed difficulty)
Questions you've seen before won't repeat until the pool resets
You have 20 minutes — exam auto-submits when time is up
Maximum 3 attempts per chapter
Results and explanations shown immediately after submission

New here? Register free — includes 3 free chapter exams.

Chapter 9: Solutions — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 11th CHEMISTRY — Chapter 9: Solutions, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which concentration unit represents the number of moles of solute per kilogram of solvent?

A. Molarity
B. Molality ✓
C. Normality
D. Mole fraction

Answer: B. Molality
Molality is defined as the number of moles of solute dissolved in 1 kg of solvent.

An ideal solution is one that obeys:

A. Raoult's law over the entire range of concentration ✓
B. Henry's law
C. Dalton's law
D. None of these

Answer: A. Raoult's law over the entire range of concentration
An ideal solution obeys Raoult's law at all concentrations and temperatures.

In a non-ideal solution, which of the following is true for a positive deviation from Raoult's law?

A. ΔHmix = 0
B. ΔVmix = 0
C. ΔHmix > 0 ✓
D. A-B interactions are stronger than A-A or B-B

Answer: C. ΔHmix > 0
For positive deviation, intermolecular forces are weaker, leading to endothermic mixing (ΔHmix > 0) and expansion in volume (ΔVmix > 0).

Two liquids A and B form an azeotropic mixture at a specific composition. This means:

A. They can be separated by fractional distillation
B. They have different boiling points
C. They distill at the same temperature without change in composition ✓
D. They obey Raoult's law perfectly

Answer: C. They distill at the same temperature without change in composition
Azeotropes are constant boiling mixtures where the liquid and vapor phases have identical compositions.

A solution contains 1 mole of solute A and 3 moles of solvent B. The mole fraction of solute A is: