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

Total questions: 25

Which of the following mixtures is a colloid?

Topic: Colloids

Salt water

Sugar solution

Milk

Alcohol and water

None

Which of the following statements is true about suspensions?

Topic: Suspensions

Particles settle on standing

Particles do not scatter light

Particles cannot be filtered

Particles in a suspension can't be separated from the mixture by filtration

None

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

Topic: Solubility

Temperature

Pressure

Nature of the solute

Nature of the solvent

None

What is the primary principle behind distillation?

Topic: Distillation

Difference in density

Difference in solubility

Difference in boiling points

Difference in melting points

None

Which of the following mixtures can be separated by filtration?

Topic: Filtration

Salt dissolved in water

Sugar dissolved in tea

Sand mixed with water

Alcohol mixed with water

None

Which of the following is a characteristic of a pure substance?

Topic: Pure Substances

It can be a mixture of elements and compounds

It has a fixed composition

It can be separated into components by physical methods

It has variable properties

None

Which technique would you use to separate a mixture of acetone and water?

Topic: Separation Techniques

Filtration

Sublimation

Simple distillation

Magnetic separation

None

Which of the following is an alloy?

Topic: Alloys

Aluminium

Copper

Brass

Hydrogen

None

Which of the following is an example of the Tyndall effect?

Topic: Colloids

Light passing through a clear glass of water

Light passing through a solution of salt in water

Light passing through fog

Light passing through a piece of wood

None

10.

Which statement is true for a true solution?

Topic: Solutions

It scatters light

The solute can be seen by the naked eyeThe solute can be seen by the naked eye

It forms a homogeneous mixture

It can be separated by filtration

None

11.

Which technique is best for separating coloured components in a dye?

Topic: Separation Techniques

Filtration

Distillation

Chromatography

Evaporation

None

12.

Which of the following increases the solubility of a gas in a liquid?

Topic: Solubility

Increasing temperature

Decreasing temperature

Increasing pressure

Decreasing pressure

None

13.

Which of the following is a homogeneous mixture?

Topic: Homogeneous Mixtures

Oil and water

Sand and water

Vinegar

Muddy water

None

14.

Which method is used to separate components of a mixture by their boiling points?

Topic: Separation Techniques

Filtration

Distillation

Chromatography

Decantation

None

15.

Which of the following statements is true for pure substances?

Topic: Pure Substances

They have a variable composition

They can be elements or compounds

They can be separated into simpler substances by physical methods

They have different properties throughout

None

16.

Which principle is chromatography based on?

Topic: Separation Techniques

Difference in solubility

Difference in boiling points

Difference in adsorption rates

Difference in density

None

17.

What characteristic property of colloids allows them to scatter light?

Topic: Colloids

Large particle size

Tyndall effect

Homogeneous nature

High density

None

18.

Which of the following is an example of a homogeneous mixture?

Topic: Mixtures

Oil and water

Sand and salt

Air

Ice in water

None

19.

Why are alloys often preferred over pure metals in industrial applications?

Topic: Alloys

Alloys are cheaper than pure metals

Alloys are always easier to produce

Alloys have improved strength and resistance to corrosion

Alloys are naturally occurring

None

20.

Which of the following solutions can be considered saturated?

Topic: Solutions

A sugar solution in which no more sugar can dissolve at a given temperature

A salt solution with excess salt crystals at the bottom

An unsaturated salt solution

A sugar solution that can still dissolve more sugar

None

21.

Calculate the molarity of a solution prepared by dissolving 5.85 g of NaCl (molar mass = 58.5 g/mol) in 250 mL of water.

Topic: Molarity

0.2 M

0.4 M

0.6 M

0.8 M

None

22.

A solid object has a mass of 450 g and displaces 150 mL of water. What is its density?

Topic: Density

2 g/cm³

3 g/cm³

4 g/cm³

5 g/cm³

None

23.

What is the percentage by mass of ethanol in a solution containing 46 g of ethanol and 54 g of water?

Topic: Percentage Composition

35%

46%

54%

76%

None

24.

How many grams of H₂SO₄ (molar mass = 98 g/mol) are required to prepare 1 L of a 0.5 M solution?

Topic: Molarity

24.5 g

34.5 g

49 g

98 g

None

25.

If 25 g of solute is dissolved in 500 mL of solution, What is the concentration of solution in g/L?

Topic: Volume Calculation

25 g/L

50 g/L

75 g/L

100 g/L

None

1 out of 25

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

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