Exploring Mixtures | Class 9 Science Notes
By ConceptScroll Team · Published on 17 July 2026 · 4 min read
Exploring Mixtures – this guide gives you a concise, exam-ready overview of Exploring Mixtures from Class 9 Science, written by ConceptScroll editors and reviewed against the latest NCERT textbook.
Filtration
Filtration is a simple and widely used method to separate insoluble solids from liquids. It is based on the difference in particle size where the solid particles are larger and cannot pass through the pores of filter paper, while the liquid passes through. The setup includes a funnel, filter paper, and a container to collect the filtrate. The mixture is poured into the funnel lined with filter paper; the liquid passes through as filtrate, and the solid remains on the filter paper as residue. Filtration is used in daily life, for example, to separate tea leaves from tea or sand from water. It is also used in industries and laboratories for purification and separation purposes. The efficiency of filtration depends on the pore size of the filter paper and the nature of the mixture.
📊 Diagram: Diagram showing a funnel with filter paper placed inside, the mixture being poured, residue collected on filter paper, and filtrate collected in a beaker below.
🧪 Activity: Filtering a mixture of sand and water to separate sand as residue and water as filtrate.
🔗 Connection: Prepares for the next section on evaporation to separate dissolved solids from solutions.
Frequently asked questions
(R): The particles in solutions are larger than 100 nm, so they cannot scatter light. Choose the correct option: (i) Both A and R are true, and R is the correct explanation of A. (ii) Both A and R are true, but R is not the correct explanation of A. (iii) A is true, but R is false. (iv) A is false, but R is true.
The correct option is (iv) A is false, but R is true. Explanation: The particles in solutions are smaller than 1 nm (typically less than 1 nm), so they cannot scatter light. The statement that particles in solutions are larger than 100 nm is false. However, the reason (R) that particles larger than 100 nm cannot scatter light is true, but since the premise (A) is false, the correct choice is (iv).
7. How would you separate the mixtures given in Table 5.3? Mention the reason for choosing your method. If a mixture cannot be separated, explain why. Table 5.3 Mixture | Method of separation | Reason for selection Mud from muddy water | | Plasma from other components in the blood sample | | Naphthalene and sand | | Chalk powder and common salt | | Common salt and water | | Oil from water | | Pigments of the flower | |
Separation methods and reasons:
1. Mud from muddy water: Method: Filtration Reason: Mud particles are insoluble and larger, so they can be separated by filtration.
2. Plasma from other components in the blood sample: Method: Centrifugation Reason: Centrifugation separates components based on density; plasma is lighter and remains on top.
3. Naphthalene and sand: Method: Sublimation Reason: Naphthalene sublimes on heating, sand does not.
4. Chalk powder and common salt: Method: Dissolve in wa
8. Two miscible liquids, A and B, are present in a mixture. The boiling point of A is 60 °C and the boiling point of B is 90 °C. Suggest a method to separate them. Also, draw a labelled diagram of the method suggested.
Method: Distillation
Explanation: Since liquids A and B are miscible and have different boiling points, they can be separated by simple distillation. The liquid with the lower boiling point (A, 60 °C) will vaporize first and can be collected by condensation.
Diagram: A labelled diagram of a distillation apparatus includes a distillation flask containing the mixture, a heat source, a condenser with water inlet and outlet, and a receiver flask to collect the distilled liquid.
9. Compare evaporation, crystallization and distillation. In which situation, would you prefer each of these over the others?
Comparison:
Evaporation:
- Used to separate a soluble solid from a liquid by evaporating the liquid.
- Simple and does not require apparatus.
- Suitable when the solid does not decompose on heating.
Crystallization:
- Used to obtain pure crystals from a solution.
- Involves evaporation followed by cooling to form crystals.
- Preferred when pure crystals are required.
Distillation:
- Used to separate miscible liquids with different boiling points.
- Involves vaporization and condensation.
- Pr
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