Class 12 Chemistry — Chapter 1: Solutions
98 practice questions · 33 Easy · 33 Medium · 32 Hard
Practise Class 12 Chemistry Chapter 1, "Solutions", with 98 NCERT-aligned multiple-choice questions. The set is split into 33 Easy, 33 Medium and 32 Hard questions, so you can warm up on the fundamentals and then push into the exam-level problems that separate top scorers in CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
"Solutions" is one of the chapters where reactions, named concepts, and balanced numerical work really pays off. Each MCQ on this chapter is timed and uses exam-grade marking (+2 correct, −1 wrong, 0 skipped), training the same accuracy-under-pressure that real papers demand. Every question carries a short explanation, so a wrong answer becomes a quick lesson rather than a dead end — the fastest way to close gaps before a test.
Use this chapter as targeted revision: attempt the Easy set first to confirm your basics on Solutions, then move to Medium and Hard to test application and problem-solving. Your accuracy, streaks and XP save automatically, and the chapter feeds into your overall Class 12 Chemistry mastery score. A few sample questions are shown below; sign in free to practise all 98.
Key concepts: Solutions (Class 12 Chemistry)
This chapter covers concentration terms, the solubility of gases (Henry's law), Raoult's law, the colligative properties, and abnormal molar masses (van't Hoff factor).
- Concentration terms
- Molarity (mol/L), molality (mol/kg) and mole fraction express the amount of solute; molality is temperature-independent.
- Henry's law
- The solubility of a gas in a liquid is proportional to its partial pressure: p = K_H·x.
- Raoult's law
- For an ideal solution, the partial vapour pressure of each component is proportional to its mole fraction.
- Colligative properties
- Relative lowering of vapour pressure, boiling-point elevation, freezing-point depression and osmotic pressure — depend on the number of solute particles, not their nature.
- van't Hoff factor
- i accounts for association or dissociation of solute; it corrects colligative-property calculations for abnormal molar mass.
Key formulas — Solutions
💡 Exam tips for Solutions
- Colligative properties depend on the NUMBER of particles — include the van't Hoff factor i for electrolytes.
- Use molality (not molarity) for ΔTb and ΔTf since it doesn't change with temperature.
Sample questions
Molarity is defined as:
Molarity (M) = moles of solute / volume of solution in litres.
What is the molarity of a solution containing 9.8 g of H₂SO₄ in 250 mL of solution? (Molar mass = 98 g/mol)
Moles = 9.8/98 = 0.1. Molarity = 0.1 / 0.250 L = 0.4 M.
Calculate the freezing point depression of a solution containing 1.8 g glucose (M = 180 g/mol) in 100 g water. K_f for water = 1.86 K·kg/mol.
Molality = (1.8/180)/0.100 = 0.1. ΔT_f = 1.86 × 0.1 = 0.186 K.
Solutions — FAQs
What are the key concepts in Class 12 Chemistry Solutions?+
This chapter covers concentration terms, the solubility of gases (Henry's law), Raoult's law, the colligative properties, and abnormal molar masses (van't Hoff factor). Key ideas include Concentration terms, Henry's law, Raoult's law, Colligative properties, van't Hoff factor.
What does Class 12 Chemistry Chapter 1 (Solutions) cover on XamBaaz?+
It covers 98 NCERT-aligned MCQs on "Solutions" — 33 Easy, 33 Medium and 32 Hard — each with a timed quiz and an instant explanation, suitable for CBSE Board exams, JEE Main, JEE Advanced and NEET UG.
Are these "Solutions" questions free to practise?+
Yes — sign in with Google to practise "Solutions" free. Full unlimited access is ₹999/year (limited-time launch price), with no per-chapter charges.
How should I revise "Solutions" for the exam?+
Start with the Easy quiz to confirm your fundamentals, then attempt Medium and Hard for application-level practice. Review each explanation, retry the questions you miss, and track your accuracy on this chapter until it is consistently high.
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