Students usually find Chapter 2 of Class 9 Science a little confusing at first because many concepts look similar. Terms like pure substance, mixture, colloid, suspension, and solution often create confusion during exams. Some questions look very easy, but the options can become tricky if the concepts are not clear properly. That is why practicing Is Matter Around Us Pure Class 9 MCQs becomes important for better understanding and revision.
This chapter mainly focuses on identifying different types of substances, understanding mixtures, and learning how different separation techniques work. Students also learn the difference between physical and chemical changes, which is one of the most commonly asked areas in school examinations. Regular practice of Is Matter Around Us Pure Class 9 MCQs helps students improve conceptual clarity and avoid common mistakes in objective questions.
These MCQs are prepared according to the latest CBSE Board and NCERT syllabus. The questions are useful for school tests, periodic assessments, annual exams, and general revision. Many competency-based questions in exams are now based on concept application, so solving objective questions regularly helps students understand the chapter more deeply.
Important Concepts Covered in Is Matter Around Us Pure Class 9 MCQs
Many questions from this chapter test whether students can identify concepts correctly instead of simply memorising definitions.
- A pure substance contains only one kind of particles.
- Solutions have uniformly mixed components.
- Suspensions are unstable mixtures where particles settle down after some time.
- Colloids appear similar to solutions but scatter light because of the Tyndall effect.
- Physical changes do not create new substances.
- Chemical changes usually form completely new substances.
- Filtration is commonly used to separate insoluble solids from liquids.
- Distillation is used to separate components based on differences in boiling points.
Students often know these concepts individually but get confused while comparing them in MCQs.
Difference Between Solution, Suspension, and Colloid
Some concepts in this chapter look closely related, which is why students make mistakes in objective questions quite often.
| Concept | Common Confusion |
|---|---|
| Solution vs Suspension | Students confuse particle visibility and settling behaviour |
| Colloid vs Solution | Both may look uniform at first glance |
| Pure Substance vs Mixture | Classification becomes confusing in practical examples |
| Physical Change vs Chemical Change | Students often misunderstand formation of new substances |
| Homogeneous vs Heterogeneous Mixture | Uniform composition creates confusion |
Most exam mistakes in this chapter happen because students select options quickly without comparing the properties carefully.
Class 9 Science Chapter 2 MCQs with Answers
Q.Which of the following statements is true about a pure substance?
A.It can be separated into other kinds of matter by physical processes.
B.It has a fixed composition.
C.It is always a mixture of two or more components.
D.Its properties are identical to those of its constituent elements.
Answer: B
Explanation: Pure substances, like elements and compounds, have a definite and fixed composition. They cannot be separated into simpler substances by physical means.
Q.Which of the following is an example of a homogeneous mixture?
A.Sand and water
B.Oil and water
C.Sugar solution
D.Iron filings and sulfur powder
Answer: C
Explanation: Homogeneous mixtures, also known as solutions, have a uniform composition and properties throughout. Sugar solution is an example where sugar particles are evenly distributed in water.
Q.A colloid is a heterogeneous mixture in which the particle size is between:
A.1 nm and 100 nm
B.Less than 1 nm
C.Greater than 100 nm
D.Exactly 1 nm
Answer: A
Explanation: Colloids are heterogeneous mixtures where the particle size is larger than that of a true solution but smaller than that of a suspension, typically between 1 nm and 100 nm.
Q.Which of the following properties is characteristic of a compound but not a mixture?
A.Components can be separated by physical methods.
B.It shows the properties of its constituent substances.
C.It has a fixed melting and boiling point.
D.Its formation involves no energy change.
Answer: C
Explanation: Compounds are pure substances formed by chemical combination of elements in a fixed ratio. They have distinct physical properties like fixed melting and boiling points, unlike mixtures.
Q.The process used to separate cream from milk is:
A.Filtration
B.Evaporation
C.Centrifugation
D.Distillation
Answer: C
Explanation: Centrifugation is a technique that uses centrifugal force to separate particles from a solution according to their size, shape, density, viscosity of the medium, and rotor speed. It's commonly used for separating cream from milk.
Q.Which of the following is a physical change?
A.Burning of wood
B.Rusting of iron
C.Melting of ice
D.Digestion
Answer: C
Explanation: Physical changes involve a change in the form of a substance, but not its chemical composition. Melting, freezing, boiling, and condensation are examples of physical changes.
Q.The Tyndall effect is exhibited by:
A.True solutions
B.Colloids
C.Both true solutions and suspensions
D.Suspensions
Answer: B
Explanation: The Tyndall effect is the scattering of light by particles in a colloid or a fine suspension, making the path of light visible. True solutions do not show this effect because their particles are too small.
Q.Which separation technique is based on the principle that components have different boiling points?
A.Chromatography
B.Filtration
C.Distillation
D.Decantation
Answer: C
Explanation: Distillation is a process of separating components of a liquid mixture by selective boiling and condensation. It relies on the difference in boiling points of the components.
Q.An element is defined as a pure substance that:
A.Can be broken down into simpler substances by chemical means.
B.Consists of only one type of atom.
C.Consists of only one type of atom.
D.Has variable composition.
Answer: B
Explanation: Elements are the simplest form of matter and cannot be broken down into simpler substances by ordinary chemical means. They are composed of only one type of atom.
Q.The separation of different pigments from an extract of flower petals can be done by:
A.Evaporation
B.Sublimation
C.Chromatography
D.Magnetic separation
Answer: C
Explanation: Chromatography is a laboratory technique for the separation of a mixture. The mixture is dissolved in a fluid called the mobile phase, which carries it through a structure holding another material called the stationary phase. The various constituents of the mixture travel at different speeds, causing them to separate.
Q.Which of the following is a characteristic of a suspension?
A.It is transparent.
B.Its particles are invisible to the naked eye.
C.Its particles settle down when left undisturbed.
D.It does not show the Tyndall effect.
Answer: C
Explanation: Suspensions are heterogeneous mixtures where solid particles are dispersed in a liquid or gas. These particles are large enough to be seen with the naked eye and will settle out over time.
Q.Brass is an example of a:
A.Compound
B.Homogeneous mixture
C.Element
D.Heterogeneous mixture
Answer: C
Explanation: Brass is an alloy, which is a solid solution of two or more metals or a metal and a non-metal. It has a uniform composition throughout, making it a homogeneous mixture.
Q.The process of converting a solid directly into a gas without passing through a liquid state is called:
A.Evaporation
B.Sublimation
C.Condensation
D.Melting
Answer: B
Explanation: Sublimation is a physical change where a substance changes from solid to gas directly. Examples include dry ice (solid CO2) and naphthalene.
Q.Which of the following mixtures can be separated by using a separating funnel?
A.Salt solution
B.Alcohol and water
C.Oil and water
D.Sugar and water
Answer: C
Explanation: A separating funnel is used for separating immiscible liquids, i.e., liquids that do not mix with each other. Oil and water form two distinct layers due to different densities and can be separated using this apparatus.
Q.Air is considered a:
A.Compound
B.Heterogeneous mixture
C.Element
D.Homogeneous mixture
Answer: D
Explanation: Air is a mixture of several gases (nitrogen, oxygen, argon, carbon dioxide, etc.) that are uniformly distributed, making it a homogeneous mixture.
Q.Which of the following will show the Tyndall effect?
A.Salt solution
B.Milk
C.Copper sulphate solution
D.Vinegar
Answer: B
Explanation: The Tyndall effect is exhibited by colloids. Milk is a colloidal solution where fat globules are dispersed in water. Salt solution, copper sulphate solution, and vinegar are true solutions and do not show the Tyndall effect.
Q.A solution in which no more solute can be dissolved at a given temperature is called a:
A.Dilute solution
B.Concentrated solution
C.Saturated solution
D.Supersaturated
Answer: C
Explanation: A saturated solution is one in which the maximum amount of solute has been dissolved at a given temperature. Any further addition of solute will not dissolve and will settle down.
Q.The components of a mixture of iodine and salt can be separated by:
A.Filtration
B.Evaporation
C.Sublimation
D.Distillation
Answer: C
Explanation: Iodine is a sublimable substance, meaning it can change directly from solid to gas upon heating. Salt (sodium chloride) does not sublime. Therefore, heating the mixture will cause iodine to sublime and separate from the salt.
Q.What is the dispersed phase and dispersed medium in fog?
A.Liquid in gas
B.Gas in liquid
C.Solid in gas
D.Gas in solid
Answer: A
Explanation: Fog is a colloid where the dispersed phase is liquid (water droplets) and the dispersed medium is gas (air). This type of colloid is called an aerosol.
Q.Which of the following is a chemical change?
A.Dissolving sugar in water
B.Cutting a log of wood
C.Burning of a candle
D.Boiling water
Answer: C
Explanation: Chemical changes result in the formation of new substances with different chemical properties. Burning involves combustion, a chemical reaction that produces new compounds.
Q.The technique used to separate magnetic substances from non-magnetic substances is:
A.Filtration
B.Magnetic separation
C.Decantation
D.Sublimation
Answer: B
Explanation: Magnetic separation is a physical process that uses magnetic force to separate components of a mixture. It's effective when one component is magnetic and the other is not, such as separating iron filings from sand.
Q.What is the main difference between a mixture and a compound?
A.Mixtures have fixed composition, compounds do not.
B.Components of a mixture are chemically combined, components of a compound are not.
C.Mixtures retain properties of constituents, compounds have new properties.
D.Mixtures are always homogeneous, compounds are always heterogeneous.
Answer: C
Explanation: The key distinction is that in a mixture, the substances merely mix without chemical reaction, retaining their original properties. In a compound, substances chemically combine to form a new substance with different properties.
Q.Which method is best suited to separate a mixture of salt and ammonium chloride?
A.Filtration
B.Evaporation
C.Sublimation
D.Chromatography
Answer: C
Explanation: Ammonium chloride is a sublimable solid, meaning it changes directly from solid to gas when heated. Salt (sodium chloride) does not sublime. This difference in property is exploited in sublimation to separate them.
Q.The process of obtaining pure water from saltwater is called:
A.Filtration
B.Distillation
C.Evaporation
D.Centrifugation
Answer: B
Explanation: Distillation involves heating the saltwater to vaporize the water, leaving the salt behind. The water vapor is then cooled and condensed back into liquid form, yielding pure water.
Q.Which of the following is NOT a property of a true solution?
A.Particles cannot be seen by the naked eye.
B.It is transparent.
C.It shows the Tyndall effect.
D.Particles do not settle down when left undisturbed.
Answer: C
Explanation: True solutions are homogeneous mixtures with very small particle sizes (less than 1 nm). Due to their small size, the particles do not scatter light, and therefore, true solutions do not exhibit the Tyndall effect.
Q.The process of separating insoluble solids from a liquid using a filter paper is called:
A.Decantation
B.Filtration
C.Evaporation
D.Centrifugation
Answer: B
Explanation: Filtration is a common laboratory and industrial technique used to separate solid particles from a fluid (liquid or gas) by interposing a medium through which only the fluid can pass.
Q.What is the term for a substance that dissolves another substance to form a solution?
A.Solute
B.Solvent
C.Solution
D.Mixture
Answer: B
Explanation: In a solution, the substance that dissolves the other component is called the solvent. The substance that is dissolved is called the solute.
Q.Which of the following is an example of a chemical compound?
A.Air
B.Water
C.Brass
D.Sugar solution
Answer: B
Explanation: A chemical compound is a pure substance formed when two or more different chemical elements are chemically bonded together. Water is a classic example.
Q.The process of separating two immiscible liquids by allowing them to settle and drawing off the lower layer is called:
A.Filtration
B.Distillation
C.Decantation
D.Evaporation
Answer: C
Explanation: Decantation is a simple separation technique that separates mixtures by removing a liquid layer from a solid or from another immiscible liquid layer. It relies on the difference in densities.
Q.What is the effect of increasing temperature on the solubility of most solids in liquids?
A.Solubility decreases
B.Solubility increases
C.Solubility remains unchanged
D.Solubility first decreases then increases
Answer: B
Explanation: Generally, as the temperature of a solvent increases, the kinetic energy of its molecules also increases. This increased movement allows them to interact more frequently and effectively with the solute particles, leading to increased solubility.
Instructions for Students Before Solving the MCQs
Read all options carefully before selecting the final answer.
- Focus on keywords like “uniform composition”, “settle down”, and “scatters light”.
- Do not confuse colloids with true solutions.
- Revise examples of homogeneous and heterogeneous mixtures properly.
- Separation techniques are important for conceptual questions.
- Try to understand the logic behind each answer instead of memorising directly.
- Re-attempt incorrect questions after revision for better understanding.
Sometimes students know the concept but still choose the wrong option because they miss small details in the question.
Mistakes Students Make in Is Matter Around Us Pure MCQs
Many students lose marks in Chapter 2 MCQs because of small conceptual confusion. Some of the most common mistakes are listed below.
- Confusing colloids with suspensions
- Mixing physical changes with chemical changes
- Forgetting examples of pure substances and mixtures
- Incorrectly identifying separation methods
- Assuming all transparent mixtures are true solutions
- Forgetting the properties of colloidal particles
- Selecting answers without checking particle behaviour carefully
A lot of questions in this chapter are application-based, so direct memorisation alone usually does not help much.
Real Life Examples of Mixtures and Solutions
The concepts from this chapter are connected with many real-life examples that students observe regularly.
- Salt water is an example of a solution.
- Milk is considered a colloid.
- Muddy water forms a suspension because particles settle down after some time.
- Water purification uses separation techniques like filtration and distillation.
- Cream separation in dairies uses centrifugation.
- Air is considered a homogeneous mixture of gases.
When students connect Science concepts with daily life examples, objective questions become easier to understand and solve.
Why Practice Is Matter Around Us Pure Class 9 MCQs?
Is Matter Around Us Pure Class 9 MCQs help students revise important concepts in a quicker and more practical way. These objective questions improve conceptual understanding and help students prepare for school exams more effectively.
Many CBSE-based questions now focus on concept application instead of direct theory. Regular MCQ practice helps students become more comfortable with such question patterns and improves accuracy during exams.
Conclusion
Practicing Is Matter Around Us Pure Class 9 MCQs regularly helps students understand important concepts like mixtures, solutions, colloids, suspensions, and separation techniques more clearly. These objective questions support better revision, improve conceptual accuracy, and help students prepare confidently for Class 9 Science examinations.