TOPIC 34 OF 46

Methods of Separation

🎓 Class 6 Science CBSE Theory Ch 9 — Methods of Separation of Substances ⏱ ~8 min
🌐 Language: [gtranslate]

This MCQ module is based on: Methods of Separation

[myaischool_lt_science_assessment grade_level="class_6" science_domain="chemistry" difficulty="basic"]

Chapter 9 at a Glance — What We Learnt

In this chapter, we explored how Indian families, farmers, and even ancient travellers separated things using the properties of the substances around them. Here is everything we covered:

Why separate?

To remove harmful bits, to get the useful part, or to get two useful parts (like water and salt from seawater).

Handpicking

Pick out unwanted pieces by hand when they are few, bigger in size, or different in colour.

Threshing

Beat cut stalks to knock grains loose from the straw — done by hand, by bullocks, or by machine.

Winnowing

Drop a grain-and-chaff mixture from a height in a breeze. Heavy grain falls; light chaff blows away.

Sieving

Pass a powder through holes; small particles fall through, big ones stay on top. Property used: size.

Sedimentation & Decantation

Let heavy solid settle in a liquid, then gently pour out the clear liquid on top.

Filtration

Use cloth or filter paper. The filtrate passes through; the residue is caught on the filter.

Magnetic separation

Use a magnet to pull out iron from a mixture where nothing else is magnetic.

Evaporation

Warm/airy conditions let water escape as vapour; the dissolved solid (like salt) is left behind.

Condensation

Water vapour cools on a cold surface and turns back into liquid water.

Crystallisation

A slow, careful form of evaporation that gives shiny, regular-shaped crystals and pure solids.

Combining methods

Most real mixtures need two or more methods together — pick the right sequence!

Keywords Grid

MixtureTwo or more substances together.
SeparationTaking the parts of a mixture apart.
HandpickingUsing fingers to pick unwanted bits.
ThreshingBeating grains out of stalks.
WinnowingLetting wind blow chaff away.
ChaffLight papery husk of grain.
SievingSeparating by size with a sieve.
SedimentationHeavy bits settle down in a liquid.
DecantationPouring out the clear liquid on top.
FiltrationTrapping solids on a porous filter.
FiltrateThe clear liquid that passes through.
ResidueThe solid left on the filter.
EvaporationLiquid turning into vapour.
CondensationVapour turning back to liquid.
CrystallisationSlow evaporation giving regular crystals.
SolutionA liquid with a solid fully dissolved in it.

Quick Reference — Which Method for Which Mixture?

MixtureBest methodProperty used
Stones in riceHandpickingSize & colour
Wheat on the stalkThreshingGrain loosens on impact
Grain + chaffWinnowingWeight
Flour + branSievingSize
Muddy waterSedimentation + decantationHeavier mud settles
Tea leaves in teaFiltrationSolid bigger than filter holes
Iron nails + sandMagnetic separationIron is magnetic
Salt + waterEvaporation / CrystallisationWater evaporates, salt stays
Vapour → waterCondensationCooling vapour becomes liquid

Exercises

Try each question on your own first. Then click Show Solution to check.

Q1. Fill in the blanks:
(a) The light papery outer cover of grain is called ______.
(b) In ______, heavy particles settle at the bottom of a liquid when left still.
(c) The clear liquid that passes through a filter is called the ______.
(d) Salt is obtained from sea water by ______.

(a) chaff   (b) sedimentation   (c) filtrate   (d) evaporation (or crystallisation).

Q2. State True or False. Correct the false ones.
(a) Handpicking is the best way to remove thousands of tiny husk pieces from a sack of rice.
(b) Iron filings can be separated from sand using a magnet.
(c) Filter paper can separate dissolved salt from water.
(d) Winnowing uses the difference in weight between the parts of a mixture.

(a) False — handpicking works only when the unwanted bits are few; for thousands, sieving or winnowing is better. (b) True. (c) False — dissolved salt passes through filter paper. Use evaporation. (d) True.

Q3. Match the method in Column A with the right example in Column B.

A — MethodB — Example
(i) Threshing(p) Separating iron nails from sawdust
(ii) Filtration(q) Getting grain out of cut wheat stalks
(iii) Magnetic separation(r) Making copper sulphate crystals
(iv) Crystallisation(s) Straining tea through a strainer

(i)–(q), (ii)–(s), (iii)–(p), (iv)–(r).

Q4. Why can we not use a sieve to separate sugar from tea?

Because sugar has dissolved in the tea — its tiny particles have mixed among the liquid particles. Sieve holes, even very small ones, are far too big to stop dissolved sugar. Only evaporation can bring the sugar back.

Q5. Rani's mother gives her a mixture of sawdust and iron nails. Describe two methods she can use to separate them, step by step.

Method 1 — Magnetic separation: Move a magnet over the mixture. The iron nails jump up and stick to the magnet. Sawdust is left behind.
Method 2 — Water floatation: Tip the mixture into a bowl of water. The sawdust floats on top; the iron nails sink. Skim off the sawdust. Pour out the water and collect the nails.

Q6. Draw a labelled diagram in words: describe the arrangement of a filtration setup with a funnel, filter paper, and a beaker.

Place an empty beaker on the table. Fit a glass funnel on top of the beaker. Fold a round piece of filter paper into a cone and place it inside the funnel so its lip sits just below the funnel rim. Slowly pour the mixture into the cone. The filtrate drips through into the beaker; the solid residue is caught on the filter paper cone.

Q7. Explain with a real-life example how sedimentation and decantation are used together.

Example — muddy river water in a village pot: (1) The bucket of muddy water is left still in the kitchen for 1–2 hours. Heavier mud particles settle at the bottom — this is sedimentation. (2) The pot is then tilted very gently, and the clearer water on top is poured into another vessel — this is decantation. The mud stays behind in the first pot.

Q8. Sai has a mixture of sand, salt, and iron filings. Write the steps he should follow, in order, to separate all three.

(1) Magnet: run a magnet over the mixture to pull out the iron filings. (2) Dissolve: add water to the remaining sand+salt. Salt dissolves; sand does not. (3) Filter: pour the water through a filter paper. Sand stays on the paper as the residue; the salt water passes through as the filtrate. (4) Evaporate: heat or sun-dry the filtrate. Water leaves as vapour; dry salt is left behind.

Q9. When hot khichdi is covered with a steel plate, water drops are seen on the plate after a few minutes. Name the two processes at work.

First, evaporation — water in the khichdi becomes vapour because of the heat. Then, condensation — the vapour meets the cooler steel plate and turns back into tiny liquid drops.

Q10. In salt pans along the Indian coast, sea water slowly turns into solid salt. Which property of water makes this possible?

Water evaporates easily in sunshine — it changes into water vapour and escapes into the air. Salt cannot evaporate at these temperatures, so it is left behind as solid crystals. In short, water's property of evaporating under mild heat makes this method possible.

Q11. Why is crystallisation considered a better method than plain evaporation for obtaining a pure solid?

In crystallisation, the hot saturated solution is cooled very slowly. Particles of the dissolved solid gently line up in a regular repeating pattern, forming clean crystals. Impurities are left in the remaining liquid. In plain evaporation, everything that was dissolved — including impurities — dries up together into a dusty solid. So the solid from crystallisation is both purer and more useful.

Q12. Ancient Indian homes often drank water that sat overnight in a clay pot before being boiled. Explain what this daily practice achieved using the ideas from this chapter.

The overnight rest allowed sedimentation — any mud or fine dust settled quietly at the bottom of the clay pot. In the morning, the clear water on top was gently taken out (decantation). Boiling the water then killed germs that could not be removed by settling. So a simple combination of three ideas — sedimentation, decantation, and heating — gave the family safe, clean drinking water without any machine.
Well done! You have finished Chapter 9. Try explaining any one separation method to a younger brother or sister — if you can teach it, you have truly learnt it!

← Back to Part 1

Frequently Asked Questions — Methods of Separation — Chapter 9 Exercises

What does the topic 'Methods of Separation — Chapter 9 Exercises' cover in Class 6 Science?

The topic 'Methods of Separation — Chapter 9 Exercises' is part of NCERT Class 6 Science Chapter 9 — Methods of Separation in Everyday Life. It covers the key ideas of separation methods, mixtures, NCERT exercises, explained through everyday examples, labelled diagrams and hands-on activities from the NCERT Curiosity textbook. Class 6 students learn simple definitions, see why each idea matters in daily life, and try short experiments and observations. The lesson uses easy language, colourful pictures and small questions so that young learners build a strong base for higher classes and for competency-based questions in CBSE school tests.

Why is 'Methods of Separation — Chapter 9 Exercises' important for Class 6 NCERT Science?

'Methods of Separation — Chapter 9 Exercises' is important because it builds the first ideas of science that Class 6 students will use again in Class 7, 8 and beyond. NCERT Chapter 9 — Methods of Separation in Everyday Life — introduces separation methods and connects it to things children already see at home, at school and in nature. Learning this topic helps students ask better questions, understand simple news about science, and score well in CBSE tests that use competency-based questions. The chapter also supports NEP 2020 by encouraging curiosity, observation and learning by doing rather than only reading and memorising.

What are the key ideas students should remember from Methods of Separation — Chapter 9 Exercises?

The key ideas in 'Methods of Separation — Chapter 9 Exercises' for Class 6 Science are: separation methods, mixtures, NCERT exercises. Students should be able to say each term in their own words, give one or two easy examples from daily life, and draw a small labelled diagram where needed. A good way to revise is to make flashcards, write a short note in the science notebook, and solve the NCERT in-text and exercise questions of Chapter 9. Linking every idea to something seen at home or school — in the kitchen, garden, playground or sky — makes these ideas easy to remember for unit tests and the annual CBSE examination.

How is Methods of Separation — Chapter 9 Exercises taught using activities in NCERT Curiosity Class 6?

NCERT Curiosity Class 6 Science teaches 'Methods of Separation — Chapter 9 Exercises' through an inquiry-based approach using Predict–Observe–Explain activities. Students first make a guess, then try a small experiment with safe, easily available materials, and finally explain what happened and why. This matches the NEP 2020 focus on learning by doing. For Chapter 9 — Methods of Separation in Everyday Life — the textbook has hands-on tasks, labelled pictures and thinking questions built for Bloom's Taxonomy Levels 1 to 6. Teachers use these activities, along with competency-based questions (CBQs) and assertion–reason items, to check real understanding instead of only rote learning.

How should Class 6 students prepare for the Chapter 9 exercises?

To prepare for the Chapter 9 — Methods of Separation in Everyday Life — exercises in NCERT Class 6 Science, students should first revise the theory in Parts 1–3 and make a short note of definitions and diagrams for separation methods, mixtures, NCERT exercises. Next, try each exercise question on their own before looking at the solution. Pay special attention to MCQs, match-the-following, fill-in-the-blanks, assertion–reason and short-answer items, as these often appear in CBSE competency-based tests. Practising with the NCERT Curiosity textbook, the exemplar questions, and the MyAiSchool practice bank helps Class 6 students score better in unit tests and the annual examination.

How does 'Methods of Separation — Chapter 9 Exercises' connect to other chapters of Class 6 Science?

'Methods of Separation — Chapter 9 Exercises' connects to many other chapters in NCERT Class 6 Science Curiosity. The ideas of separation methods come back when students study related topics like diversity in the living world, food, magnets, measurement, materials, temperature, water, separation, habitats, natural resources and the solar system. For example, what students learn here helps them build mental pictures for later chapters and for Class 7 and Class 8 Science. Teachers often ask cross-chapter questions in CBSE exams to check if students can use what they learned in Chapter 9 — Methods of Separation in Everyday Life — in new situations. This linked approach matches the NEP 2020 and NCF 2023 focus on holistic, competency-based learning.

AI Tutor
Science Class 6 — Curiosity
Ready
Hi! 👋 I'm Gaura, your AI Tutor for Methods of Separation. Take your time studying the lesson — whenever you have a doubt, just ask me! I'm here to help.