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Solutions

NIOS · Class 12 · Chemistry

Complete topic list for Solutions in NIOS Class 12 Chemistry. Key concepts, sub-topics, and what to focus on for board exams.

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4 Topics · NIOS Class 12 Chemistry

Topics in Solutions

1

1. Components and Definitions of Solutions

  • A solution is a homogeneous mixture of two or more substances with uniform composition throughout
  • Solute is the substance dissolved (usually present in smaller amount)
  • Solvent is the substance that dissolves the solute (usually present in larger amount and determines the physical state of solution)
2

2. Concentration of Solutions

  • Concentration expresses the amount of solute in a given amount of solvent or solution
  • Five main methods: Molarity, Molality, Normality, Mole Fraction, and Mass Percentage
  • Molarity (M) - moles of solute per litre of solution (temperature dependent)
3

3. Types of Solutions

  • Solutions classified based on physical states of solute and solvent (9 possible combinations)
  • Common types: Gas in liquid (soda water), Liquid in liquid (alcohol-water), Solid in liquid (sugar in water), Solid in solid (alloys)
  • Liquids in liquids: completely miscible (alcohol-water), partially miscible (water-phenol), immiscible (water-benzene)
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4. Vapour Pressure and Raoult's Law

  • Vapour pressure is pressure exerted by vapours in equilibrium with liquid phase
  • Equilibrium established when evaporation rate equals condensation rate
  • Raoult's law: partial vapour pressure of volatile component proportional to its mole fraction

Key Concepts

A solution is a homogeneous mixtureMolarity is defined as the numberMolality is defined as the numberNormality is the number of gramMole fraction of a component

Frequently Asked Questions

What are the important topics in Solutions for NIOS Class 12 Chemistry?
Solutions covers several key topics that are frequently asked in NIOS Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Solutions — NIOS Class 12 Chemistry?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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