Mixtures and Their Separation - ICSE Class 6 (Chemistry)

🧪 ICSE Class 6 Chemistry
Mixtures and Their Separation

100+ Questions MCQ · Fill · T/F · Match · Short · Long

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MCQ (1-15) Fill (16-26) T/F (27-34) Match (35-38) VSA (39-46) SA (47-54) LA (55-59) Extra (60-64)

📝 Multiple Choice Questions

1-15

MCQ 1

A mixture of mustard oil and water forms:
(a) Compound (b) Alloy (c) Homogeneous mixture (d) Heterogeneous mixture

✅ Answer: (d) Heterogeneous mixture

MCQ 2

An example of homogeneous mixture is:
(a) Sand and water (b) Salt solution (c) Sawdust and water (d) Oil and water

✅ Answer: (b) Salt solution

MCQ 3

Which of the following is a pure substance?
(a) Air (b) Sea water (c) Gold (d) Milk

✅ Answer: (c) Gold

MCQ 4

Which of the following is a compound?
(a) Brass (b) Carbon dioxide (c) Soil (d) Ink

✅ Answer: (b) Carbon dioxide

MCQ 5

Composition of mixture is:
(a) Fixed (b) Not fixed (c) Definite (d) Constant

✅ Answer: (b) Not fixed

MCQ 6

An alloy is:
(a) A compound (b) Homogeneous mixture (c) Heterogeneous mixture (d) Element

✅ Answer: (b) Homogeneous mixture

MCQ 7

Steel is an alloy of:
(a) Iron and copper (b) Iron and carbon (c) Copper and zinc (d) Aluminium and copper

✅ Answer: (b) Iron and carbon

MCQ 8

The method used to separate iron filings from sand:
(a) Filtration (b) Magnetic separation (c) Sublimation (d) Evaporation

✅ Answer: (b) Magnetic separation

MCQ 9

Camphor can be separated by:
(a) Filtration (b) Sublimation (c) Decantation (d) Sieving

✅ Answer: (b) Sublimation

MCQ 10

Salt from sea water is obtained by:
(a) Sedimentation (b) Filtration (c) Evaporation (d) Sieving

✅ Answer: (c) Evaporation

MCQ 11

Which of the following is a heterogeneous mixture?
(a) Brass (b) Milk (c) Air (d) Sugar solution

✅ Answer: (b) Milk

MCQ 12

A compound is formed by:
(a) Physical mixing (b) Chemical combination (c) Filtration (d) Sieving

✅ Answer: (b) Chemical combination

MCQ 13

The liquid that passes through filter paper is called:
(a) Residue (b) Filtrate (c) Sediment (d) Solvent

✅ Answer: (b) Filtrate

MCQ 14

Separating funnel is used to separate:
(a) Miscible liquids (b) Immiscible liquids (c) Solid-solid mixtures (d) Gas-liquid mixtures

✅ Answer: (b) Immiscible liquids

MCQ 15

Which pair forms a compound on heating?
(a) Iron and sulphur (b) Sand and salt (c) Oil and water (d) Sugar and water

✅ Answer: (a) Iron and sulphur

📋 Fill in the Blanks

16-26

Fill 16

A substance made of only one kind of particle is called a __________.

✅ Answer: Pure substance

Fill 17

A mixture has no fixed __________.

✅ Answer: Composition

Fill 18

The substances forming a mixture are called __________.

✅ Answer: Components

Fill 19

The solid left on filter paper is called __________.

✅ Answer: Residue

Fill 20

The clear liquid obtained after decantation is called __________.

✅ Answer: Supernatant liquid

Fill 21

Settling of heavier particles is called __________.

✅ Answer: Sedimentation

Fill 22

Pouring off clear liquid is called __________.

✅ Answer: Decantation

Fill 23

Sublimation is a process in which solid changes directly into __________.

✅ Answer: Vapour

Fill 24

An alloy is a __________ mixture of metals.

✅ Answer: Homogeneous

Fill 25

Separation method depends upon the __________ of components.

✅ Answer: Properties

🔘 True / False

26-33

T/F 26

Compounds have fixed composition.

✅ Answer: True

T/F 27

Mixtures can be separated by chemical methods only.

✅ Answer: False

T/F 28

Distilled water is a pure substance.

✅ Answer: True

T/F 29

Iron sulphide is a mixture.

✅ Answer: False (It's a compound)

T/F 30

Evaporation separates insoluble solid from liquid.

✅ Answer: False (Filtration does that)

T/F 31

Brass is an alloy.

✅ Answer: True

T/F 32

Mixtures retain properties of their components.

✅ Answer: True

T/F 33

Air has fixed chemical formula.

✅ Answer: False

🔗 Match the Following

34-37

Match 34-37

Column A	Column B
(a) Evaporation	(i) Camphor
(b) Sublimation	(ii) Iron filings
(c) Magnetic separation	(iii) Salt from sea water
(d) Separating funnel	(iv) Oil and water

✅ Answer:
(a) → (iii)
(b) → (i)
(c) → (ii)
(d) → (iv)

📌 Very Short Answer Questions

38-46

VSA 38

Define mixture.

✅ Answer: Combination of two or more substances in any proportion without chemical reaction.

VSA 39

Define compound.

✅ Answer: Pure substance formed by chemical combination of elements in fixed ratio.

VSA 40

Define alloy.

✅ Answer: Homogeneous mixture of two or more metals.

VSA 41

What is filtration?

✅ Answer: Separation of insoluble solid from liquid using filter paper.

VSA 42

What is distillation?

✅ Answer: Method to obtain pure liquid by evaporation and condensation.

VSA 43

Write molecular formula of sulphuric acid.

✅ Answer: H₂SO₄

VSA 44

Write molecular formula of carbon dioxide.

✅ Answer: CO₂

VSA 45

Name a liquid non-metal.

✅ Answer: Bromine

📝 Short Answer Questions

46-54

SA 46

Give two differences between mixture and compound.

✅ Answer:
Mixture: Variable composition; properties retained.
Compound: Fixed composition; new properties formed.

SA 47

How will you separate sand and salt?

✅ Answer: Add water → Filter → Evaporate filtrate.

SA 48

Why is magnet used to separate iron and sulphur?

✅ Answer: Iron is magnetic; sulphur is non-magnetic.

SA 49

What happens when iron and sulphur are heated?

✅ Answer: They form iron sulphide compound.

SA 50

Name components of Brass.

✅ Answer: Copper and zinc

SA 51

Name components of Bronze.

✅ Answer: Copper and tin

SA 52

Name components of Duralumin.

✅ Answer: Aluminium, copper, magnesium, manganese

📚 Long Answer Questions

53-57

LA 53

State four differences between compounds and mixtures.

✅ Answer:
Compound: Fixed composition; Chemical combination; New properties; Separated by chemical methods.
Mixture: Variable composition; Physical mixing; Properties retained; Separated by physical methods.

LA 54

Explain sedimentation and decantation with example.

✅ Answer: Heavier particles settle at bottom (sedimentation). Clear liquid is poured out (decantation). Example: Sand and water mixture.

LA 55

Explain distillation with example.

✅ Answer: Solution is heated → Vapour forms → Vapour condensed → Pure liquid obtained. Example: Obtaining pure water from salt solution.

⭐ Extra Important Questions

56-61

Extra 56

Why compounds have fixed melting point but mixtures do not?

✅ Answer: Compounds have fixed composition; mixtures do not.

Extra 57

Why air cannot be represented by a formula?

✅ Answer: It is a mixture with variable composition.

Extra 58

Give three characteristics of mixture.

✅ Answer: No fixed composition; Components retain properties; Can be separated physically.

Extra 59

Explain difference between iron + sulphur mixture and iron sulphide.

✅ Answer: Mixture — Properties retained; separated by magnet. Iron sulphide — New compound; cannot be separated by magnet.

Extra 60

Why alum is used in water purification?

✅ Answer: It helps suspended particles settle faster.

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Mixtures and Their Separation

ICSE Class 6 Chemistry · 100+ Handpicked Questions with Answers. MCQ · Fill · T/F · Match · Short · Long & Extra.

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