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CBSE Class 9  >  Class 9 Test  >  Online MCQ Tests  >  HOTS Questions: Is Matter Around Us Pure - Class 9 MCQ

HOTS Questions: Is Matter Around Us Pure - Free MCQ Test with solutions


MCQ Practice Test & Solutions: HOTS Questions: Is Matter Around Us Pure (10 Questions)

You can prepare effectively for Class 9 Online MCQ Tests for Class 9 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "HOTS Questions: Is Matter Around Us Pure". These 10 questions have been designed by the experts with the latest curriculum of Class 9 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 10 minutes
  • - Number of Questions: 10

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HOTS Questions: Is Matter Around Us Pure - Question 1
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Which of the following is a colloidal solution? 

Detailed Solution: Question 1

 Starch solution

Explanation: A colloidal solution consists of tiny particles suspended in a continuous medium. The particle size in a colloid is between that of a true solution and a suspension, meaning the particles do not settle out upon standing.

  • Starch solution is a colloid because the starch particles are small enough to remain suspended in water without settling.
  • Copper sulphate solution is a true solution, not a colloid.
  • Chalk powder in water is a suspension, as the chalk particles settle down when left undisturbed.
  • Kerosene oil and water form an immiscible liquid mixture, not a colloid.

Thus, a starch solution is the correct example of a colloidal solution.

HOTS Questions: Is Matter Around Us Pure - Question 2
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Which of the following is a physical change? 

Detailed Solution: Question 2

Physical Changes:
A physical change is a change in the state or form of matter without any change in the chemical composition or identity of the substance. In other words, the substance remains the same before and after the change.
Examples of Physical Changes:
A. Burning of a Natural Gas:
- This is a clear example of a combustion reaction. Natural gas comprehends methane gas. When methane reacts with oxygen in the atmosphere it produces water and carbon dioxide.
B. Rusting of iron:
- This is a chemical change, not a physical change. Rusting occurs when iron reacts with oxygen in the presence of moisture, forming iron (III) oxide (rust).
C. Freezing of water:
- This is a physical change. When water is cooled below its freezing point, it undergoes a phase change from a liquid to a solid, forming ice. The chemical composition of water (H2O) remains the same.
D. Digestion of food:
- This is a chemical change, not a physical change. Digestion involves the breakdown of complex food molecules into simpler substances through various chemical reactions in the digestive system.
Conclusion:
The freezing of water is the only example mentioned that represents a physical change. The other options involve chemical changes.

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HOTS Questions: Is Matter Around Us Pure - Question 3
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Which of the following statements about mixtures is true?

Detailed Solution: Question 3

  • Homogeneous mixtures (also called solutions) have a uniform composition throughout, but the proportions of their components can vary. For example, a sugar-water solution can have different amounts of sugar dissolved in water.

  • Heterogeneous mixtures do not have a uniform composition, and their components are visibly distinct (e.g., a mixture of sand and iron filings).

  • A salt solution is a homogeneous mixture, not a heterogeneous one.

  • Homogeneous mixtures do not always have a fixed composition, as their components can be mixed in varying proportions.

Thus, option a) is correct.

HOTS Questions: Is Matter Around Us Pure - Question 4
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What determines whether a solution is dilute, concentrated, or saturated?

Detailed Solution: Question 4

  • A solution's classification depends primarily on the relative proportion of solute to solvent.
  • When there is a small amount of solute compared to the solvent, the solution is termed dilute.
  • If the solute amount is significant, the solution is referred to as concentrated.
  • A saturated solution occurs when no more solute can dissolve in the solvent at a specific temperature.
  • Different solutes have varying solubilities, affecting how they are classified in a solution.

HOTS Questions: Is Matter Around Us Pure - Question 5
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Who was the first scientist to define an element as a basic form of matter that cannot be broken down further by chemical reactions?

Detailed Solution: Question 5

Antoine Lavoisier was the first scientist to clearly define an element as a basic form of matter that cannot be broken down into simpler substances by chemical reactions.

While Robert Boyle used the term "element" and argued against the classical Greek concepts, it was Lavoisier who, in 1789, provided the modern definition of an element as a substance that cannot be decomposed by chemical means.

Thus the correct option is a).

HOTS Questions: Is Matter Around Us Pure - Question 6
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40 g of common salt is dissolved in 320 g of water. The mass percentage of salt is 

Detailed Solution: Question 6

Mass of common salt (solute) = 40g
Mass of water (soluted) = 320g
Mass of solution = 320 + 40 = 360g
Concentration of solution = M(mass of solute) / mass of solution = 40/360 x 100 = 11.11%

HOTS Questions: Is Matter Around Us Pure - Question 7
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The particles of suspension 

Detailed Solution: Question 7

The particles of suspension:
- Can be seen with the naked eye. Suspensions are heterogeneous mixtures in which solid particles are dispersed in a liquid or gas. These particles are usually large enough to be visible to the naked eye.
- Cannot be seen with a powerful microscope. While the particles in a suspension may not be visible under a powerful microscope, they can still be seen without the aid of any magnification.
- Cannot be seen with an electron microscope. Electron microscopes are capable of magnifying objects to a much higher degree than light microscopes, but even they may not be able to visualize the particles in a suspension due to their size and distribution.
- Are larger than the particles in a solution. In contrast to solutions, where the solute particles are evenly distributed and too small to be seen, the particles in a suspension are larger and can settle over time due to gravity.
- Can be separated by filtration or settling. Since the particles in a suspension are larger and more visible, they can be separated from the liquid or gas phase through processes such as filtration or allowing them to settle and then decanting the liquid above.

HOTS Questions: Is Matter Around Us Pure - Question 8
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Which of the following statement is true about compounds?

Detailed Solution: Question 8

Statement: Compound is homogeneous and have fixed composition.

Definition of compound:
- A compound is a substance that is composed of two or more elements chemically combined in a fixed ratio.
- It has its own unique set of properties that are different from the properties of its constituent elements.
Explanation:
- A homogeneous mixture is a mixture that has a uniform composition throughout, meaning that the components are evenly distributed.
- A compound is a type of homogeneous mixture because it has a fixed composition.
- The elements in a compound are combined in a specific ratio, which means that the relative amounts of the elements are always the same.
- This fixed composition gives compounds their distinct properties and makes them different from mixtures.
Key points:
- A compound is homogeneous, meaning it has a uniform composition throughout.
- The composition of a compound is fixed, with elements combined in a specific ratio.
- Compounds have distinct properties that are different from the properties of their constituent elements.
Conclusion:
The correct statement is option A: Compound is homogeneous and has a fixed composition.

HOTS Questions: Is Matter Around Us Pure - Question 9
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 The particles of colloidal solution can be separated by 

Detailed Solution: Question 9

  • Centrifugation is a process used to separate particles of a colloidal solution.
  • In this method, the mixture is spun at high speeds, which causes the denser particles to move outward and separate from the rest of the solution.
  • Filtration is not effective because colloidal particles are too small to be captured by ordinary filter paper.
  • Evaporation and distillation are not suitable methods for separating colloidal particles.

HOTS Questions: Is Matter Around Us Pure - Question 10
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Which of the following statement is always true when a substance undergoes physical change

Detailed Solution: Question 10

Explanation:
When a substance undergoes a physical change, its composition remains the same. This means that the atoms or molecules that make up the substance do not rearrange or combine with other atoms or molecules to form a new substance. Instead, the physical properties of the substance may change, such as its shape, size, density, state (solid, liquid, gas), or phase (melting, freezing, boiling, condensation).
Key points:
- Physical change refers to a change in the physical properties of a substance without any change in its chemical composition.
- In a physical change, the substance may change its state (e.g., from solid to liquid or gas) or undergo a change in physical properties (e.g., color, shape, size), but the composition of the substance remains the same.
- The atoms or molecules that make up the substance do not rearrange or combine with other atoms or molecules to form a new substance.
- Examples of physical changes include melting ice, boiling water, dissolving salt in water, and crushing a can.

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This test contains 10 MCQs on HOTS Questions: Is Matter Around Us Pure with detailed solutions for each question. It is part of the Online MCQ Tests for Class 9 course on EduRev, designed to align with the current Class 9 syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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