This Class 12 Chemistry worksheet on Solutions, along with its detailed solutions, is designed mainly for CBSE board exam preparation and competitive exam revision. The worksheet contains 75 multiple-choice questions, all strictly aligned with NCERT content. It covers concentration terms, types of solutions, vapour pressure, Raoult’s law, Henry’s law, ideal and non-ideal solutions, colligative properties, osmotic pressure, Van’t Hoff factor, azeotropes, and a wide range of real-life applications. The solutions explain not only the final answer but also the reasoning and formulas used, making this worksheet a strong learning and practice resource Solutions WS 1 (1).
I am writing about this worksheet because the chapter on Solutions is often seen as formula-heavy, yet students still lose marks due to conceptual confusion. Mistakes usually happen while choosing the correct concentration unit, applying colligative property formulas, or interpreting Raoult’s and Henry’s laws in MCQs. A worksheet with properly explained answers helps bridge this gap. By analysing these questions carefully, students can clearly understand how NCERT theory is converted into exam-style one-mark questions and how to avoid common traps.
Structure of the Solutions Worksheet
The worksheet consists of 75 MCQs, each carrying one mark, followed by a comprehensive solution section. The questions include direct concept-based MCQs, numerical problems, assertion-type logic, and application-based situations. Many questions look simple on the surface but are designed to test conceptual clarity rather than lengthy calculations.
The overall difficulty level ranges from easy to moderate, making this worksheet suitable for revision, self-assessment, and last-minute practice.
Concentration Terms and Numerical Applications
A significant portion of the worksheet focuses on concentration terms such as:
- Molarity, molality, normality, and mole fraction
- Relationship between molarity and normality
- Units independent of temperature
- Numerical problems involving dilution and preparation of solutions
These questions test whether students can correctly choose and apply the appropriate concentration unit in different scenarios Solutions WS 1 (1).
Types of Solutions and Solubility Concepts
Several MCQs are based on classification and solubility, including:
- Gas in gas, gas in liquid, liquid in solid, and solid in solid solutions
- Examples like hydrogen in palladium and mercury in zinc
- Effect of temperature and pressure on solubility of gases
- Supersaturated, saturated, and unsaturated solutions
These questions are frequently asked as direct one-mark questions in exams.
Vapour Pressure and Raoult’s Law
The worksheet includes many questions on vapour pressure and Raoult’s law, such as:
- Relative lowering of vapour pressure
- Raoult’s law for non-volatile solutes
- Ideal versus non-ideal solutions
- Positive and negative deviation from Raoult’s law
- Azeotropes and their boiling behaviour
These questions require conceptual understanding rather than memorisation.
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Henry’s Law and Gas Solubility
Henry’s law is tested through both conceptual and numerical MCQs. Topics include:
- Relationship between solubility and pressure
- Henry’s law constant and its significance
- Gases with higher and lower solubility
- Applications like scuba diving, soda bottles, and high-altitude sickness
This section connects chemistry with real-life situations.
Colligative Properties
A major part of the worksheet is dedicated to colligative properties. Students are tested on:
- Lowering of vapour pressure
- Elevation of boiling point
- Depression of freezing point
- Osmotic pressure
Questions clearly emphasise that colligative properties depend only on the number of solute particles, not their nature.
Van’t Hoff Factor and Abnormal Molar Mass
Several MCQs involve the Van’t Hoff factor, including cases of:
- Dissociation of electrolytes like NaCl, BaCl₂, and CaCl₂
- Association of molecules
- Effect of Van’t Hoff factor on boiling point and freezing point
These questions are common scoring areas if handled carefully.
Osmosis, Isotonic Solutions and Biological Applications
The worksheet includes multiple questions on osmosis and osmotic pressure, such as:
- Behaviour of plant cells in hypertonic and hypotonic solutions
- Isotonic solutions and their properties
- Swelling and shrinking of cells
- Raw mango shrinking in salt solution
These questions link chemistry concepts with biology and daily life.
Real-Life and Conceptual MCQs
Many questions relate theory to real-life observations, including:
- Use of pressure cookers
- Antifreeze action of ethylene glycol
- Why soda water fizzes when opened
- Why ammonia cylinders are cooled before opening
Such questions are frequently asked in exams and are easy scoring if concepts are clear.
What Students Can Learn from This Worksheet
From analysing this worksheet and its solutions, a few clear points stand out:
- Correct selection of formulas is more important than memorisation
- Colligative properties depend only on particle count
- Van’t Hoff factor requires careful handling
- Raoult’s law deviations are high-weight topics
- Practising solved MCQs improves speed and confidence
Overall, this Class 12 Solutions worksheet with solutions is a strong revision and practice resource. It helps students strengthen conceptual clarity, improve numerical accuracy, and gain confidence in handling MCQs from one of the most important physical chemistry chapters.
