Chemistry 9th Chap 2 : Topic 6 - Maryam Publications

Chemistry Chapter 2 : Topic 6

Types of Mixtures

1 / 25

A student prepares three different mixtures:
I. Salt completely dissolved in water
II. Milk mixed with water showing light scattering
III. Sand mixed in water that settles down after some time
Which classification is correct for I, II, and III respectively?

A) Colloid, Solution, Suspension

B) Suspension, Colloid, Solution

C) Solution, Colloid, Suspension

D) Suspension, Solution, Colloid

2 / 25

A mixture is prepared in which particles are so small that they cannot be seen even under a microscope, and the mixture remains stable without settling. It also cannot be separated by filtration. This mixture is:

A) Heterogeneous mixture of coarse particles

B) Colloid

C) Solution

D) Suspension

3 / 25

Which statement best distinguishes a colloid from a true solution?

A) Colloids can be separated by simple filtration

B) Colloids always contain solid particles in liquid only

C) Colloids show Tyndall effect due to scattering of light

D) Colloids have visible particles that settle over time

4 / 25

A muddy river water sample is left undisturbed for several hours. Sand particles settle at the bottom while water becomes clearer. This mixture is classified as:

A) Suspension

B) Colloid

C) Homogeneous mixture

D) Solution

5 / 25

Which of the following best describes a true solution?

A) A mixture in which particles scatter light and remain suspended

B) A mixture with visible particles that settle down

C) A mixture showing Tyndall effect and Brownian motion strongly

D) A homogeneous mixture with solute particles not visible and not separable by filtration

6 / 25

Milk is classified as a colloid because:

A) It shows Tyndall effect and remains stable without settling

B) It can be separated easily by filtration

C) Its particles are large enough to settle quickly

D) It is a heterogeneous mixture with visible particles

7 / 25

A student observes a beam of light passing through a mixture. The path of light becomes visible due to scattering by particles. This mixture is most likely:

A) Pure substance

B) Solution

C) Compound

D) Colloid

8 / 25

Which of the following is NOT a characteristic of suspensions?

A) Cannot be separated by filtration

B) Particles settle down on standing

C) Particles are large and visible

D) Heterogeneous in nature

9 / 25

A sugar solution appears completely uniform and transparent. What type of mixture is it?

A) Solution

B) Colloid

C) Suspension

D) Emulsion

10 / 25

Which statement correctly describes particle size order in mixtures?

A) Solution < Colloid < Suspension

B) Suspension < Colloid < Solution

C) Colloid < Solution < Suspension

D) Solution < Suspension < Colloid

11 / 25

Which of the following mixtures will show no Tyndall effect?

A) Fog

B) Starch solution

C) Milk in water

D) Sugar in water

12 / 25

Fog is classified as a colloid because:

A) It is a gas dispersed in liquid showing light scattering

B) It contains large dust particles that settle quickly

C) It is a suspension of water in air

D) It is a true solution of gases

13 / 25

Which method is most suitable to separate sand from water?

A) Filtration

B) Distillation

C) Evaporation

D) Chromatography

14 / 25

A mixture has particles that are intermediate in size, do not settle quickly, and cannot be filtered easily. It is:

A) Solution

B) Suspension

C) Pure compound

D) Colloid

15 / 25

Which property is common to both solutions and colloids but NOT suspensions?

A) Visible particles

B) Stability over time

C) Particle settling

D) Heterogeneous nature

16 / 25

Blood is considered a colloid because:

A) It behaves like a true solution

B) It contains dispersed particles that remain suspended

C) It can be filtered easily through ordinary filters

D) Cells settle rapidly in plasma

17 / 25

Which mixture will show fastest settling of particles?

A) Muddy water

B) Sugar solution

C) Air

D) Milk

18 / 25

Which of the following is NOT a distinguishing property of solutions?

A) No scattering of light

B) Cannot be separated by filtration

C) Particles visible to naked eye

D) Homogeneous mixture

19 / 25

A mixture that can pass through filter paper without leaving residue is most likely:

A) Colloid

B) Suspension

C) Emulsion

D) Solution

20 / 25

Which statement best explains Brownian motion in colloids?

A) Particles become visible under microscope due to light reflection

B) Large particles settle due to gravity

C) Particles form chemical bonds with the medium

D) Random movement of dispersed particles due to collisions with molecules

21 / 25

Which mixture type is always heterogeneous?

A) Both B and C

B) Solution

C) Suspension

D) Colloid

22 / 25

Why is salt water considered a true solution but milk is not?

A) Salt water is heterogeneous

B) Milk is a pure substance

C) Salt water shows Tyndall effect

D) Milk has larger dispersed particles that scatter light

23 / 25

Which mixture would require centrifugation for separation?

A) Salt water

B) Milk

C) Air

D) Sugar solution

24 / 25

Which of the following correctly lists mixtures in increasing particle size?

A) Solution → Suspension → Colloid

B) Suspension → Colloid → Solution

C) Solution → Colloid → Suspension

D) Colloid → Solution → Suspension

25 / 25

A mixture remains cloudy but does not settle even after long standing. It is likely:

A) Colloid

B) Pure liquid

C) Suspension

D) Solution

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