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Practice Class 9 Science Chapter 2 – Is Matter Around Us Pure? with 5 NCERT-based MCQs on suspensions, their properties, heterogeneous mixtures, particle visibility, settling and separation of suspended particles.
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Chapter Information
Subject: Science
Class: 9
Chapter: Is Matter Around Us Pure?
Question Type: Multiple Choice Questions (MCQs)
Practice Set: 4
Difficulty Level: Moderate
Based On: NCERT Syllabus
Introduction
Not all mixtures behave like true solutions. Some mixtures contain particles that are large enough to be seen or that can settle down when the mixture is left undisturbed.
A suspension is a heterogeneous mixture in which insoluble solid particles are dispersed in a liquid. Its particles can usually be seen with the naked eye, settle down on standing and can be separated by filtration.
This Practice Set 4 focuses on the important characteristics of suspensions and helps students distinguish them from solutions.
What You Will Learn
✔ Meaning of suspension
✔ Characteristics of suspensions
✔ Heterogeneous nature of suspensions
✔ Visibility of suspension particles
✔ Settling of suspended particles
✔ Filtration of suspensions
✔ Difference between solutions and suspensions
Why This Topic Is Important
Suspensions are an important type of mixture discussed in Is Matter Around Us Pure?
Students often confuse suspensions with solutions because both may contain a substance dispersed in a liquid. Understanding their different properties helps in answering conceptual MCQs and identifying mixtures correctly.
5 MCQs with Answers and Detailed Solutions
Q1. Which of the following is an example of a suspension?
A) Salt solution
B) Sugar solution
C) Muddy water
D) Air
Answer: C) Muddy water
Detailed Solution
Muddy water is a suspension because insoluble particles of mud are dispersed in water.
These particles are large enough to be visible, can settle down when the mixture is left undisturbed and can be separated from water by filtration.
Salt solution and sugar solution are homogeneous mixtures, while air is a homogeneous mixture of gases.
Exam Tip
Remember: Muddy water → Suspension because the dispersed particles are insoluble and can settle down.
Q2. Which statement correctly describes a suspension?
A) It is always a pure substance.
B) It is a homogeneous mixture.
C) It is a heterogeneous mixture containing insoluble particles.
D) Its particles can never be separated.
Answer: C) It is a heterogeneous mixture containing insoluble particles.
Detailed Solution
A suspension is a heterogeneous mixture in which insoluble solid particles are dispersed in a liquid.
The particles are sufficiently large to be visible and can settle down when the suspension is left undisturbed.
Therefore, a suspension is not a pure substance or a homogeneous mixture.
Exam Tip
The three important words for suspension are heterogeneous, insoluble and settle down.
Q3. What happens to the particles of a suspension when it is left undisturbed?
A) They completely disappear.
B) They settle down at the bottom.
C) They become a pure substance.
D) They change into a solution.
Answer: B) They settle down at the bottom.
Detailed Solution
The particles in a suspension are relatively large and are not completely dissolved in the medium.
When the suspension is left undisturbed, these particles gradually settle down at the bottom due to gravity.
This property helps distinguish a suspension from a true solution.
Exam Tip
If particles settle down on standing, the mixture is likely a suspension.
Q4. Which method can be used to separate the particles of a suspension from its liquid?
A) Filtration
B) Melting
C) Sublimation only
D) Crystallisation only
Answer: A) Filtration
Detailed Solution
The particles present in a suspension are sufficiently large to be retained by a suitable filter.
Therefore, filtration can be used to separate the suspended particles from the liquid.
For example, insoluble particles of mud can be separated from water by filtration.
Exam Tip
Remember: Suspension → Filtration is an important separation relationship.
Q5. Which property of a suspension is different from that of a true solution?
A) It contains a solvent.
B) It may contain a liquid medium.
C) Its particles can settle down on standing.
D) It can contain more than one component.
Answer: C) Its particles can settle down on standing.
Detailed Solution
A true solution is a homogeneous mixture in which solute particles are extremely small and do not settle down when the solution is left undisturbed.
In contrast, particles of a suspension are large enough to settle down under gravity.
Therefore, settling of particles is an important property that distinguishes a suspension from a true solution.
Exam Tip
For comparison questions, remember: solution particles do not settle, suspension particles settle.
Important Formulas & Concepts
This topic does not involve a major mathematical formula. The following scientific concepts are important.
1. Suspension
A suspension is a heterogeneous mixture in which insoluble solid particles are dispersed in a liquid.
2. Particle Size
Suspension particles are sufficiently large to be visible and can be separated by filtration.
3. Settling
Suspended particles settle down when the mixture is left undisturbed.
4. Filtration
Filtration can be used to separate insoluble suspended particles from a liquid.
5. Heterogeneous Nature
A suspension has a non-uniform composition.
6. Difference from a Solution
A true solution is homogeneous and its particles do not settle down on standing, whereas suspension particles can settle down.
Related Practice Questions
Q1. What is a suspension?
Q2. Why is muddy water considered a suspension?
Q3. What happens to suspension particles when the mixture is left undisturbed?
Q4. Which method can separate suspended particles from a liquid?
Q5. Why is a suspension classified as a heterogeneous mixture?
Mini Quiz Challenge
Try answering these questions within 60 seconds.
Q1. Which of the following is a suspension?
A) Salt solution
B) Muddy water
C) Sugar solution
D) Air
Q2. Suspension particles generally:
A) Settle down on standing
B) Never settle down
C) Become dissolved completely
D) Turn into gases
Q3. A suspension can generally be separated by:
A) Filtration
B) Melting
C) Freezing only
D) Burning
Q4. A suspension is:
A) A pure substance
B) A homogeneous mixture
C) A heterogeneous mixture
D) An element
Q5. Which statement is correct?
A) Suspension particles are always invisible.
B) Suspension particles can settle down on standing.
C) Suspension particles are completely dissolved.
D) Suspensions always have a fixed composition.
Exam Tips
✔ Remember that a suspension is a heterogeneous mixture.
✔ Learn the property that suspension particles settle down on standing.
✔ Remember that suitable suspended particles can be separated by filtration.
✔ Use muddy water as a common example of a suspension.
✔ Do not confuse a suspension with a true solution.
Quick Revision Notes
✔ Suspension: Heterogeneous mixture containing insoluble particles.
✔ Suspension particles are relatively large.
✔ The particles can generally be seen.
✔ Particles settle down on standing.
✔ Suspended particles can be separated by filtration.
✔ A suspension has a non-uniform composition.
✔ A true solution does not show settling of solute particles on standing.
Common Mistakes Students Make
❌ Thinking a suspension is a homogeneous mixture.
❌ Confusing muddy water with a true solution.
❌ Forgetting that suspension particles settle down.
❌ Thinking suspended particles are completely dissolved.
❌ Choosing evaporation instead of filtration for separating insoluble suspended particles.
❌ Thinking all mixtures have the same particle behaviour.
Key Takeaways
✔ A suspension is a heterogeneous mixture.
✔ Its particles are relatively large and can generally be seen.
✔ Suspension particles can settle down when left undisturbed.
✔ Filtration can separate suitable suspended particles from a liquid.
✔ Muddy water is a common example of a suspension.
✔ Suspensions are different from true solutions because their particles can settle down.
FAQs
Q. What is a suspension?
Answer:
A suspension is a heterogeneous mixture in which insoluble solid particles are dispersed in a liquid.
Q. Give an example of a suspension.
Answer:
Muddy water is a common example of a suspension.
Q. What happens when a suspension is left undisturbed?
Answer:
The suspended particles settle down at the bottom due to gravity.
Q. Can a suspension be separated by filtration?
Answer:
Yes. The relatively large suspended particles can be separated from the liquid by suitable filtration.
Q. Is a suspension homogeneous or heterogeneous?
Answer:
A suspension is a heterogeneous mixture because its composition is not uniform throughout.
Q. How is a suspension different from a solution?
Answer:
A suspension contains relatively large insoluble particles that can settle down on standing, whereas particles in a true solution are extremely small and do not settle down.
Conclusion
Class 9 Science Chapter 2 – Is Matter Around Us Pure? focuses on the important characteristics of suspensions, including their heterogeneous nature, particle visibility, settling behaviour and separation by filtration.
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