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Class 9 · Science · Chapter 2: Is Matter Around Us Pure?

BSEB Class 9 Science Chapter 2: Objective Questions (MCQ) with Answers

Bihar Board · NCERT · CBSE

All 61 objective questions (MCQ) of this chapter — solve first, then tap “Show answer”. Each question shows its source label: «BSEB 2025 · board paper» = verified from the official board paper; «Board-style (practice)» = Study With Me's own practice questions.

← Chapter 2: Is Matter Around Us Pure? — full notes, video, questions

1Check1 mark

Which of these is a heterogeneous mixture?

  1. (A) sugar in water
  2. (B) salt in water
  3. (C) oil and water
  4. (D) copper sulphate solution
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Correct answer: (C) oil and water

Oil and water form separate layers.

2Check1 mark

In tincture of iodine, the solvent is

  1. (A) water
  2. (B) alcohol
  3. (C) iodine
  4. (D) acetone
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Correct answer: (B) alcohol

Iodine (solid) is dissolved in alcohol (liquid).

3Check1 mark

25 g sugar is dissolved in 100 g water. Mass percentage =

  1. (A) 25%
  2. (B) 20%
  3. (C) 12.5%
  4. (D) 80%
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Correct answer: (B) 20%

25/125 × 100 = 20%.

4Check1 mark

Which shows the Tyndall effect?

  1. (A) salt solution
  2. (B) copper sulphate solution
  3. (C) milk
  4. (D) sugar solution
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Correct answer: (C) milk

Milk is a colloid.

5Check1 mark

Butter is separated from curd by

  1. (A) distillation
  2. (B) centrifugation
  3. (C) sublimation
  4. (D) chromatography
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Correct answer: (B) centrifugation

Spinning brings the lighter fat to the top.

6Check1 mark

A mixture of salt and ammonium chloride is separated by

  1. (A) filtration
  2. (B) sublimation
  3. (C) centrifugation
  4. (D) chromatography
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Correct answer: (B) sublimation

Ammonium chloride sublimes, salt does not.

7Check1 mark

Pigments from an extract of flower petals are separated by

  1. (A) chromatography
  2. (B) distillation
  3. (C) centrifugation
  4. (D) filtration
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Correct answer: (A) chromatography

The pigments dissolve in the same solvent.

8Check1 mark

Which gas liquefies first as air is cooled?

  1. (A) nitrogen
  2. (B) argon
  3. (C) oxygen
  4. (D) helium
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Correct answer: (C) oxygen

Oxygen has the highest boiling point (−183 °C).

9Check1 mark

Why use crystallisation instead of evaporation for sugar?

  1. (A) sugar evaporates
  2. (B) sugar gets charred on heating to dryness
  3. (C) sugar does not dissolve
  4. (D) sugar is magnetic
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Correct answer: (B) sugar gets charred on heating to dryness

Book: solids like sugar get charred.

10Check1 mark

Which is a chemical change?

  1. (A) ice melting
  2. (B) dissolving salt
  3. (C) rusting of an almirah
  4. (D) cutting trees
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Correct answer: (C) rusting of an almirah

Rust is a new substance.

11Check1 mark

The non-metal that is liquid at room temperature is

  1. (A) mercury
  2. (B) bromine
  3. (C) gallium
  4. (D) iodine
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Correct answer: (B) bromine

Mercury is a liquid metal; bromine a liquid non-metal.

12Book-based · Intro · p. 141 mark

To a scientist, a pure substance contains

  1. (A) two kinds of particles
  2. (B) a single kind of particles
  3. (C) only elements
  4. (D) only compounds
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Correct answer: (B) a single kind of particles

Answer: a single kind of particles.

13Book-based · 2.1.1 · p. 151 mark

An example of a homogeneous mixture is

  1. (A) oil + water
  2. (B) salt + iron filings
  3. (C) sugar in water
  4. (D) salt + sulphur
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Correct answer: (C) sugar in water

Answer: sugar in water.

14Book-based · More to know · p. 151 mark

Brass contains about how much zinc?

  1. (A) 70%
  2. (B) 30%
  3. (C) 50%
  4. (D) 10%
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Correct answer: (B) 30%

Answer: 30%.

15Book-based · 2.2 · p. 161 mark

Particles of a solution are

  1. (A) smaller than 1 nm
  2. (B) about 1 mm
  3. (C) about 1 cm
  4. (D) visible
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Correct answer: (A) smaller than 1 nm

Answer: smaller than 1 nm.

16Book-based · 2.2 · p. 161 mark

Nitrogen in air is about

  1. (A) 21%
  2. (B) 78%
  3. (C) 50%
  4. (D) 1%
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Correct answer: (B) 78%

Answer: 78%.

17Book-based · 2.2 · p. 161 mark

In soda water the solute is

  1. (A) water
  2. (B) carbon dioxide
  3. (C) oxygen
  4. (D) sugar
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Correct answer: (B) carbon dioxide

Answer: carbon dioxide.

18Book-based · Example 2.1 · p. 171 mark

40 g salt in 320 g water — mass percentage

  1. (A) 12.5%
  2. (B) 11.1%
  3. (C) 8.9%
  4. (D) 40%
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Correct answer: (B) 11.1%

Answer: 11.1%.

19Book-based · 2.2.3 · p. 171 mark

Milk is a

  1. (A) solution
  2. (B) suspension
  3. (C) colloid
  4. (D) element
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Correct answer: (C) colloid

Answer: colloid.

20Book-based · Table 2.1 · p. 181 mark

Shaving cream is which type of colloid?

  1. (A) aerosol
  2. (B) foam
  3. (C) gel
  4. (D) sol
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Correct answer: (B) foam

Answer: foam.

21Book-based · Table 2.1 · p. 181 mark

In fog the dispersion medium is

  1. (A) liquid
  2. (B) solid
  3. (C) gas
  4. (D) plasma
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Correct answer: (C) gas

Answer: gas.

22Book-based · 2.3.2 · p. 201 mark

The method used in blood and urine tests is

  1. (A) centrifugation
  2. (B) sublimation
  3. (C) distillation
  4. (D) crystallisation
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Correct answer: (A) centrifugation

Answer: centrifugation.

23Book-based · 2.3.4 · p. 201 mark

Which does NOT sublime?

  1. (A) camphor
  2. (B) naphthalene
  3. (C) anthracene
  4. (D) common salt
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Correct answer: (D) common salt

Answer: common salt.

24Book-based · 2.3.6 · p. 221 mark

Fractional distillation is used when the boiling-point difference is

  1. (A) less than 25 K
  2. (B) more than 25 K
  3. (C) 100 K
  4. (D) zero
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Correct answer: (A) less than 25 K

Answer: less than 25 K.

25Book-based · 2.5.1 · p. 251 mark

Who first used the term "element"?

  1. (A) Lavoisier
  2. (B) Robert Boyle
  3. (C) Dalton
  4. (D) Tyndall
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Correct answer: (B) Robert Boyle

Answer: Robert Boyle.

26Book-based · 2.5.1 · p. 251 mark

A metalloid is

  1. (A) silicon
  2. (B) sodium
  3. (C) sulphur
  4. (D) mercury
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Correct answer: (A) silicon

Answer: silicon.

27Book-based · Table 2.1 · p. 181 mark

Fog, clouds and mist are which type of colloid?

  1. (A) emulsion
  2. (B) aerosol
  3. (C) gel
  4. (D) sol
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Correct answer: (B) aerosol

Answer: aerosol.

28Book-based · Table 2.1 · p. 181 mark

Smoke and automobile exhaust are

  1. (A) liquid-in-gas aerosols
  2. (B) foams
  3. (C) emulsions
  4. (D) solid-in-gas aerosols
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Correct answer: (D) solid-in-gas aerosols

Answer: solid-in-gas aerosols.

29Book-based · Table 2.1 · p. 181 mark

Milk and face cream are which type of colloid?

  1. (A) sol
  2. (B) foam
  3. (C) emulsion
  4. (D) solid sol
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Correct answer: (C) emulsion

Answer: emulsion.

30Book-based · Table 2.1 · p. 181 mark

Milk of magnesia and mud are

  1. (A) sols
  2. (B) gels
  3. (C) aerosols
  4. (D) foams
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Correct answer: (A) sols

Answer: sols.

31Book-based · Table 2.1 · p. 181 mark

In rubber, sponge and pumice the dispersed phase is

  1. (A) liquid
  2. (B) solid
  3. (C) gas
  4. (D) plasma
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Correct answer: (C) gas

Answer: gas.

32Book-based · Table 2.1 · p. 181 mark

Jelly, cheese and butter are

  1. (A) gels
  2. (B) emulsions
  3. (C) sols
  4. (D) aerosols
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Correct answer: (A) gels

Answer: gels.

33Book-based · Table 2.1 · p. 181 mark

Coloured gemstone and milky glass are

  1. (A) gels
  2. (B) emulsions
  3. (C) solid sols
  4. (D) foams
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Correct answer: (C) solid sols

Answer: solid sols.

34Book-based · 2.2.3 · p. 171 mark

The component in which colloid particles are spread is the

  1. (A) solute
  2. (B) filtrate
  3. (C) residue
  4. (D) dispersion medium
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Correct answer: (D) dispersion medium

Answer: dispersion medium.

35Book-based · 2.2.3 · p. 171 mark

The Tyndall effect in a beam entering a room through a small hole is due to

  1. (A) oxygen molecules
  2. (B) dust and smoke particles
  3. (C) water molecules
  4. (D) light particles
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Correct answer: (B) dust and smoke particles

Answer: dust and smoke particles.

36Book-based · 2.2.2 · p. 171 mark

When a suspension is left undisturbed

  1. (A) the colour deepens
  2. (B) it becomes a solution
  3. (C) the particles settle down
  4. (D) the particles vanish
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Correct answer: (C) the particles settle down

Answer: the particles settle down.

37Book-based · 2.2.2 · p. 171 mark

A suspension is a

  1. (A) compound
  2. (B) heterogeneous mixture
  3. (C) pure substance
  4. (D) homogeneous mixture
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Correct answer: (B) heterogeneous mixture

Answer: heterogeneous mixture.

38Book-based · 2.2.1 · p. 161 mark

"Dilute" and "concentrated" are

  1. (A) used only for gases
  2. (B) comparative terms
  3. (C) fixed units
  4. (D) units of temperature
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Correct answer: (B) comparative terms

Answer: comparative terms.

39Book-based · 2.2.1 · p. 161 mark

An unsaturated solution has solute that is ______ the saturation level.

  1. (A) more than
  2. (B) zero compared with
  3. (C) less than
  4. (D) equal to
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Correct answer: (C) less than

Answer: less than.

40Book-based · 2.3.2 · p. 201 mark

Dairies separate butter from cream by

  1. (A) chromatography
  2. (B) centrifugation
  3. (C) distillation
  4. (D) sublimation
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Correct answer: (B) centrifugation

Answer: centrifugation.

41Book-based · 2.3.2 · p. 201 mark

On spinning in a centrifuge, denser particles

  1. (A) dissolve
  2. (B) stay on top
  3. (C) evaporate
  4. (D) go to the bottom
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Correct answer: (D) go to the bottom

Answer: go to the bottom.

42Book-based · 2.3.3 · p. 201 mark

An industrial use of the separating-funnel principle is

  1. (A) testing blood
  2. (B) liquefying air
  3. (C) fractionating petroleum
  4. (D) removing lighter slag while extracting iron
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Correct answer: (D) removing lighter slag while extracting iron

Answer: removing lighter slag while extracting iron.

43Book-based · 2.3.3 · p. 201 mark

The separating funnel works because

  1. (A) immiscible liquids form layers by density
  2. (B) boiling points differ
  3. (C) of magnetism
  4. (D) solubilities differ
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Correct answer: (A) immiscible liquids form layers by density

Answer: immiscible liquids form layers by density.

44Book-based · 2.3.4 · p. 201 mark

Naphthalene and anthracene can be separated from salt by

  1. (A) sublimation
  2. (B) crystallisation
  3. (C) centrifugation
  4. (D) filtration
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Correct answer: (A) sublimation

Answer: sublimation.

45Book-based · 2.3.5 · p. 211 mark

In chromatography the more soluble colour

  1. (A) rises faster
  2. (B) stays at the bottom
  3. (C) disappears
  4. (D) leaves the paper
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Correct answer: (A) rises faster

Answer: rises faster.

46Book-based · 2.3.5 · p. 211 mark

The paper used in the chromatography activity is

  1. (A) glossy paper
  2. (B) plastic sheet
  3. (C) newspaper
  4. (D) filter paper
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Correct answer: (D) filter paper

Answer: filter paper.

47Book-based · 2.3.6 · p. 211 mark

Acetone and water are separated by

  1. (A) centrifugation
  2. (B) separating funnel
  3. (C) magnet
  4. (D) distillation
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Correct answer: (D) distillation

Answer: distillation.

48Book-based · 2.3.6 · p. 211 mark

In distillation, acetone vapour is cooled in the

  1. (A) funnel
  2. (B) condenser
  3. (C) beaker
  4. (D) flask
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Correct answer: (B) condenser

Answer: condenser.

49Book-based · 2.3.6 · p. 221 mark

Different fractions from petroleum products are separated by

  1. (A) fractional distillation
  2. (B) crystallisation
  3. (C) decantation
  4. (D) sublimation
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Correct answer: (A) fractional distillation

Answer: fractional distillation.

50Book-based · 2.3.7 · p. 221 mark

Before separating its gases, air is

  1. (A) compressed and cooled
  2. (B) heated
  3. (C) dissolved in water
  4. (D) filtered
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Correct answer: (A) compressed and cooled

Answer: compressed and cooled.

51Book-based · 2.3.7 · p. 231 mark

The boiling point of argon is

  1. (A) 0 °C
  2. (B) −183 °C
  3. (C) −196 °C
  4. (D) −186 °C
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Correct answer: (D) −186 °C

Answer: −186 °C.

52Book-based · 2.3.8 · p. 231 mark

Copper sulphate crystals are obtained (Activity 2.9) by

  1. (A) centrifugation
  2. (B) distillation
  3. (C) crystallisation
  4. (D) sublimation
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Correct answer: (C) crystallisation

Answer: crystallisation.

53Book-based · 2.4 · p. 241 mark

Burning of a candle involves

  1. (A) no change
  2. (B) only a chemical change
  3. (C) only a physical change
  4. (D) both physical and chemical changes
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Correct answer: (D) both physical and chemical changes

Answer: both physical and chemical changes.

54Book-based · 2.4 · p. 241 mark

In a chemical change

  1. (A) only the state changes
  2. (B) only the shape changes
  3. (C) nothing changes
  4. (D) chemical properties change
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Correct answer: (D) chemical properties change

Answer: chemical properties change.

55Book-based · 2.5.1 · p. 251 mark

Who defined an element as "a basic form of matter that cannot be broken down into simpler substances by chemical reactions"?

  1. (A) Lavoisier
  2. (B) Dalton
  3. (C) Boyle
  4. (D) Proust
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Correct answer: (A) Lavoisier

Answer: Lavoisier.

56Book-based · 2.5.1 · p. 251 mark

Metals can be hammered into thin sheets — this property is

  1. (A) ductility
  2. (B) malleability
  3. (C) lustre
  4. (D) sonority
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Correct answer: (B) malleability

Answer: malleability.

57Book-based · 2.5.1 · p. 251 mark

Metals being drawn into wires is

  1. (A) conductivity
  2. (B) sonority
  3. (C) malleability
  4. (D) ductility
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Correct answer: (D) ductility

Answer: ductility.

58Book-based · 2.5.1 · p. 251 mark

Which of these is a non-metal?

  1. (A) aluminium
  2. (B) copper
  3. (C) mercury
  4. (D) iodine
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Correct answer: (D) iodine

Answer: iodine.

59Book-based · 2.5.1 · p. 251 mark

An example of a metalloid is

  1. (A) germanium
  2. (B) sodium
  3. (C) gold
  4. (D) chlorine
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Correct answer: (A) germanium

Answer: germanium.

60Book-based · More to know · p. 251 mark

How many elements are gases at room temperature?

  1. (A) 11
  2. (B) 5
  3. (C) 92
  4. (D) 2
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Correct answer: (A) 11

Answer: 11.

61Book-based · More to know · p. 251 mark

Gallium and cesium become liquid at a temperature slightly above room temperature, i.e.

  1. (A) 373 K
  2. (B) 353 K
  3. (C) 273 K
  4. (D) 303 K
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Correct answer: (D) 303 K

Answer: 303 K.

← Chapter 2: Is Matter Around Us Pure? — full notes, video, questions