Exploring Mixtures and Their Separation — Class 9 Science NCERT Solutions (Free)

Free step-by-step NCERT solutions for Class 9 Science chapter "Exploring Mixtures and Their Separation" — 8 important questions with detailed answers for CBSE board exam preparation.

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TL;DR: Free step-by-step NCERT solutions for Class 9 Science chapter "Exploring Mixtures and Their Separation" — 8 important questions with detailed answers…

Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated Jul 23, 2026

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Key Questions Covered:

Define pure substances and mixtures.
What is a solution? Give two examples.
Define suspension and colloid with examples.
Compare solutions, suspensions, and colloids.
What is the Tyndall effect?
Name four separation techniques for mixtures.
+ 2 more questions in the full chapter

Solutions Summary:

Question	Status
Define pure substances and mixtures.	✓ Solved
What is a solution? Give two examples.	✓ Solved
Define suspension and colloid with examples.	✓ Solved
Compare solutions, suspensions, and colloids.	✓ Solved
What is the Tyndall effect?	✓ Solved
Name four separation techniques for mixtures.	✓ Solved

Showing 6 of 8 questions

Q1: Define pure substances and mixtures.

Pure substances have definite composition and fixed physical properties (e.g., water, salt). Mixtures are combinations of two or more substances that retain individual properties (e.g., salt water, air). Mixtures can be separated into components.

Q2: What is a solution? Give two examples.

A solution is a homogeneous mixture where one substance (solute) dissolves completely in another (solvent). Examples: salt water, sugar solution, salt dissolved in alcohol. Properties: transparent, particles not visible even under microscope, no precipitation on standing.

Q3: Define suspension and colloid with examples.

Suspension: heterogeneous mixture where particles settle on standing (e.g., chalk powder in water, sand in water) Colloid: mixture where particles are intermediate in size; appear homogeneous but scatter light (e.g., milk, starch solution, paint)

Q4: Compare solutions, suspensions, and colloids.

Solutions: homogeneous, particles <1 nm, transparent, no settling, pass through filter Colloids: appear homogeneous, particles 1-100 nm, scatter light (Tyndall), no settling, pass through filter Suspensions: heterogeneous, particles >100 nm, opaque, settle out, blocked by filter

Q5: What is the Tyndall effect?

The Tyndall effect is the scattering of light by colloidal particles. When light passes through a colloid, the path of the light beam becomes visible because colloidal particles scatter the light in all directions.

Q6: Name four separation techniques for mixtures.

1. Filtration - separates insoluble solids from liquids 2. Evaporation - separates solute from solvent by heating 3. Distillation - separates volatile liquid from non-volatile solute 4. Chromatography - separates components based on differential movement Others: decantation, sublimation, magnetic separation

Showing 6 of 8 questions. Visit the full page for complete solutions.