Class 6 Science

Chapter 9 Solutions — Methods of Separation in Everyday Life

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Solutions

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Step-by-step NCERT solutions for Methods of Separation in Everyday Life (Chapter 9, NCERT Class 6 Science) — every question and answer worked out in full, not just the final result. You can also read the Methods of Separation in Everyday Life textbook chapter.

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All 10 questions in Methods of Separation in Everyday Life are solved in the PDF. Here's what's inside, exercise by exercise:

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1.
What purpose does handpicking serve in the process of separation?
- (i) Filtration
- (ii) Sorting
- (iii) Evaporation
- (iv) Decantation
2.
Which of the following substances are commonly separated using the churning method?
- (i) Oil from water
- (ii) Sand from water
- (iii) Cream from milk
- (iv) Oxygen from air
3.
Which factor is usually essential for filtration?
- (i) Apparatus size
- (ii) Presence of air
- (iii) Pore size
- (iv) Temperature of the mixture
4.
State with reason(s) whether the following statements are True [T] or False [F]. Also, correct the False statement(s).
- (i) Salt can be separated from salt solution by keeping it under the Sun.
- (ii) Handpicking should be used only when the quantity of one component is less.
- (iii) A mixture of puffed rice and rice grains can be separated by threshing.
- (iv) A mixture of mustard oil and lemon water…
5.
Match the mixtures in Column I with their method of separation in Column II. Column I:
- (i) Gram flour mixed with black gram
- (ii) Chalk powder mixed with water
- (iii) Corn mixed with potatoes
- (iv) Iron powder mixed with sawdust
- (v) Oil mixed with water Column II:
- (a) Handpicking
- (b) Magnetic separation
- (c) Decantation
- (d) Sieving
- (e) Filtration
In what situations would you use decantation instead of filtration to separate solids from liquids?
Can you relate the presence of nasal hair to any separation process?
During the COVID-19 pandemic, all of us wore masks. Generally, what material are they made of? What is the role of these masks?
A mixture containing potatoes, salt and sawdust has been given to you. Outline a stepwise procedure for separating each component from this mixture.
Read the following story titled 'Intelligent Leela' and tick the most appropriate options. Provide a suitable title of your choice for the paragraph. Leela was working in the farm with her father when she realised that they left their drinking water at home. Before her father felt thirsty/hungry, she went to the nearby pond to fetch some water/grains. After obtaining some water in the container…

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Worked examples

3 questions from Methods of Separation in Everyday Life, solved step by step.

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What purpose does handpicking serve in the process of separation? (i) Filtration (ii) Sorting (iii) Evaporation (iv) Decantation

Handpicking is done on the basis of differences in size, colour, and shape of particles.

It is used to pick out substances by hand — for example, removing small stones and husk from wheat or rice.

This is essentially sorting — selecting and removing specific particles from a mixture by hand.

Filtration involves passing a liquid through a filter; evaporation converts a liquid to vapour; decantation involves tilting a vessel to remove liquid after sedimentation.

None of those match the purpose of handpicking.

Answer: (ii) Sorting

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Which of the following substances are commonly separated using the churning method? (i) Oil from water (ii) Sand from water (iii) Cream from milk (iv) Oxygen from air

Churning is used when a lighter component needs to be separated from a liquid mixture by spinning or agitation.

The chapter describes churning curd using a mathni (churner) to separate butter — butter (lighter) floats to the top, buttermilk is left behind.

The same principle applies to separating cream from milk.

Oil from water is separated by decantation (oil forms a separate layer). Sand from water uses sedimentation and decantation/filtration. Oxygen from air requires industrial methods.

Cream from milk is the standard example of churning given in the chapter.

Answer: (iii) Cream from milk

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Which factor is usually essential for filtration? (i) Apparatus size (ii) Presence of air (iii) Pore size (iv) Temperature of the mixture

Filtration separates insoluble solid particles from a liquid by passing the mixture through a filter.

The chapter states that the choice of filter depends on the size of particles of the materials to be removed.

A filter paper has very fine pores; cloth has small pores between woven threads. Larger pores let larger particles through; smaller pores trap finer particles.

Apparatus size, air, and temperature are not the determining factor — pore size determines what passes through and what is retained.

Answer: (iii) Pore size

All 10 questions in Methods of Separation in Everyday Life are solved step by step in the Solutions PDF above.

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Chapter 9 Solutions — Methods of Separation in Everyday Life

Overview

What these solutions cover

Let Us Enhance Our Learning

Worked examples

What purpose does handpicking serve in the process of separation? (i) Filtration (ii) Sorting (iii) Evaporation (iv) Decantation

Which of the following substances are commonly separated using the churning method? (i) Oil from water (ii) Sand from water (iii) Cream from milk (iv) Oxygen from air

Which factor is usually essential for filtration? (i) Apparatus size (ii) Presence of air (iii) Pore size (iv) Temperature of the mixture

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