Chapter Exam

Chapter-1 Solutions — Online MCQ Test

Q: Which of the following represents the correct definition of molarity?

Answer: B. Number of moles of solute per litre of solution — Molarity (M) is defined as the number of moles of solute dissolved per litre of the solution.

Q: A 0.1 M solution of NaCl in water has a molality approximately equal to:

Answer: B. 0.1 m — For dilute aqueous solutions, molarity and molality are approximately equal since 1 litre of solution ≈ 1000 g of solvent.

Q: Which of the following statements about mole fraction is correct?

Answer: B. Mole fraction is dimensionless — Mole fraction is a dimensionless quantity, ranging from 0 to 1, and the sum of mole fractions of all components equals 1.

Q: Which of the following represents the correct expression for the elevation in boiling point, considering the van't Hoff factor for electrolytes?

Answer: B. ΔTb = Kb × i × m — For electrolytes, the boiling point elevation is ΔTb = Kb × i × m, where i is the van't Hoff factor accounting for dissociation.

CHEMISTRY · CLASS 12 SECOND PUC · Karnataka State Board

Practice Chapter-1 Solutions with a free chapter-wise online MCQ test for Karnataka State Board CLASS 12 SECOND PUC CHEMISTRY. This chapter covers: types of solutions - concentration terms - Henry's Law - Raoult's Law - colligative properties. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-1 Solutions — Important Questions & Answers (FAQ)

Frequently asked questions from Karnataka State Board CLASS 12 SECOND PUC CHEMISTRY — Chapter-1 Solutions, with answers and explanations. These are sample questions; the exam has its own separate question set.

A solution is a homogeneous mixture of two or more substances. Which of the following is NOT a characteristic of a solution?

A. It has a uniform composition throughout
B. The solute particles are visible under a microscope ✓
C. It is transparent
D. The solute does not settle down on standing

Answer: B. The solute particles are visible under a microscope
Solutions are homogeneous mixtures where solute particles are molecular or ionic in size and invisible under a microscope, unlike suspensions or colloids.

Which of the following represents the correct definition of molarity?

A. Number of moles of solute per 1000 g of solvent
B. Number of moles of solute per litre of solution ✓
C. Number of grams of solute per 100 mL of solution
D. Number of moles of solute per kilogram of solvent

Answer: B. Number of moles of solute per litre of solution
Molarity (M) is defined as the number of moles of solute dissolved per litre of the solution.

A 0.1 M solution of NaCl in water has a molality approximately equal to:

A. 0.05 m
B. 0.1 m ✓
C. 0.15 m
D. 0.2 m

Answer: B. 0.1 m
For dilute aqueous solutions, molarity and molality are approximately equal since 1 litre of solution ≈ 1000 g of solvent.

Which of the following statements about mole fraction is correct?

A. Mole fraction can be greater than 1
B. Mole fraction is dimensionless ✓
C. Mole fraction is temperature-dependent
D. The sum of mole fractions of all components in a solution is always 0.5

Answer: B. Mole fraction is dimensionless
Mole fraction is a dimensionless quantity, ranging from 0 to 1, and the sum of mole fractions of all components equals 1.

Which of the following represents the correct expression for the elevation in boiling point, considering the van't Hoff factor for electrolytes?

A. ΔTb = Kb × m
B. ΔTb = Kb × i × m ✓
C. ΔTb = Kb/m
D. ΔTb = Kb × m²

Answer: B. ΔTb = Kb × i × m
For electrolytes, the boiling point elevation is ΔTb = Kb × i × m, where i is the van't Hoff factor accounting for dissociation.