Class 9 Practice Level 3 – Set 2 – Is Matter Around Us Pure?

Total questions: 15

Which method can be used to coagulate a colloid?

Topic: Colloids

Adding an electrolyte

Heating the colloid

Diluting the colloid

Filtering the colloid

None

In thin-layer chromatography (TLC), what is the stationary phase typically made of?

Topic: Chromatography

Water

Silica gel or alumina

Ethanol

Paper

None

Which of the following does not affect the solubility of a solid in a liquid?

Topic: Solutions

Temperature

Nature of the solvent

Nature of the solute

Atmospheric pressure

None

Which alloy is used in the manufacture of aircraft parts?

Topic: Alloys

Brass

Bronze

Stainless steel

Duralumin

None

Which of the following statements about compounds is incorrect?

Topic: Pure Substances

They are formed by chemical combination of two or more elements.

They can be separated into their elements by physical means.

They have properties different from their constituent elements.

They have a fixed composition.

None

Which property distinguishes colloids from true solutions?

Topic: Colloids

Ability to dissolve completely

Ability to scatter light

Homogeneous nature

Consistent particle size

None

Which of the following mixtures is not homogeneous?

Topic: Homogeneous Mixtures

Air

Vinegar

Brass

Sand and salt

None

Which factor does not influence the rate of dissolving of a solid solute in a solvent?

Topic: Solubility

Temperature

Stirring

Particle size of the solute

Volume of solvent

None

Which statement best describes a solution?

Topic: Mixtures

It is always a liquid.

It has a uniform composition throughout.

It can be separated by filtration.

It is a heterogeneous mixture.

None

10.

Which of the following is an example of an aerosol?

Topic: Colloids

Milk

Smoke

Gelatine

Sugar solution

None

11.

Which of the following separation techniques is based on the difference in solubility of components?

Topic: Separation Techniques

Chromatography

Filtration

Distillation

Decantation

None

12.

Which of the following can increase the solubility of a gas in water?

Topic: Solutions

Decreasing the pressure

Increasing the temperature

Decreasing the temperature

Stirring vigorously

None

13.

Which of the following is an incorrect statement about elements?

Topic: Pure Substances

They are pure substances.

They can be broken down into simpler substances by chemical means.

They have unique physical and chemical properties.

They are made up of one type of atom.

None

14.

Which of the following is an alloy of iron and carbon?

Topic: Alloys

Brass

Bronze

Steel

Duralumin

None

15.

Which of the following methods can be used to separate a mixture of two immiscible liquids?

Topic: Separation Techniques

Distillation

Filtration

Separating funnel

Chromatography

None

1 out of 15

Class 9 Practice Level 3 – Set 2 – Is Matter Around Us Pure?

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