Is Matter Around Us Pure? — Class 9 MCQs with Answers
Class 9 CBSE Science · Chapter 4
90 practice questions · 30 Easy · 30 Medium · 30 Hard · Updated
Practise the most important Class 9 CBSE Science questions from Chapter 4, "Is Matter Around Us Pure?". You get 9 timed quizzes made from 90 NCERT-based MCQs, with answers and explanations. The questions are split into 30 Easy, 30 Medium and 30 Hard. Warm up on the basics, then move on to the exam-level questions that set top scorers in CBSE Board exams and the JEE & NEET foundation years apart.
To score well in "Is Matter Around Us Pure?", focus on clear concepts in physics, chemistry and biology basics. Each MCQ here is timed and uses exam-style marking (+4 correct, −1 wrong, 0 skipped). This trains you to stay accurate under time pressure, as real papers need. Every question has a short explanation, so a wrong answer becomes a quick lesson. It is the fastest way to fix gaps before a test.
Use this chapter for focused revision. Start with the Easy set to check your basics on Is Matter Around Us Pure?, then move to Medium and Hard to practise applying them. Your accuracy, streaks and XP save automatically. This chapter also adds to your overall Class 9 Science mastery score. 14 sample questions are solved in full below, with the answer and a worked explanation. Sign in free to start practising.
Key concepts: Is Matter Around Us Pure? (Class 9 Science)
A pure substance has a fixed composition, while a mixture does not. This chapter separates mixtures from pure substances, distinguishes elements from compounds, classifies solutions, colloids and suspensions, and covers the standard separation techniques.
- Pure substance
- A substance made of only one kind of particle with a fixed composition throughout, such as an element or a compound.
- Mixture
- A material containing two or more substances mixed in any proportion, each keeping its own properties.
- Homogeneous and heterogeneous mixtures
- A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture has visibly distinct parts.
- Element
- A pure substance made of only one kind of atom, which cannot be broken into simpler substances by chemical means.
Is Matter Around Us Pure? — important questions & MCQs with answers (Class 9 Science)
14 solved questions from this chapter's difficulty levels, each with its answer and explanation. The other 76 are timed and scored when you sign in.
- Q1Easy
A homogeneous mixture is also called a:
A.ElementB.SuspensionC.CompoundD.Solution✓ CorrectAnswer: D. Solution
Explanation: A mixture with the same composition throughout, like sugar dissolved in water, is called a solution; suspensions and colloids are not uniform enough to earn that name.
- Q2Easy
Which of these is an element?
A.Iron✓ CorrectB.AirC.WaterD.BrassAnswer: A. Iron
Explanation: Iron is a pure element made of only one type of atom. Water is a compound of hydrogen and oxygen, while air and brass are mixtures of several substances.
- Q3Easy
Filtration separates:
A.Two miscible liquidsB.An insoluble solid from a liquid✓ CorrectC.Two gasesD.Solute from solventAnswer: B. An insoluble solid from a liquid
Explanation: Filtration works when a solid piece is too large to pass through the filter paper's pores, separating an insoluble solid from a liquid — it cannot separate a dissolved solute or two liquids.
- Q4Easy
In a sugar solution in water, the solvent is:
A.SugarB.NeitherC.BothD.Water✓ CorrectAnswer: D. Water
Explanation: The solvent is the component present in the larger amount that dissolves the other; in sugar-water, water dissolves the sugar and is present in excess, so it is the solvent.
- Q5Easy
Which of the following is a compound?
A.BrassB.AirC.Carbon dioxide✓ CorrectD.SteelAnswer: C. Carbon dioxide
Explanation: CO₂ forms when carbon and oxygen combine chemically in a fixed atom ratio, making it a compound, unlike brass, air and steel, which are mixtures with variable composition.
- Q6Easy
Common salt is obtained from sea water by:
A.FiltrationB.DistillationC.Evaporation✓ CorrectD.ChromatographyAnswer: C. Evaporation
Explanation: Heating sea water drives off the water as vapour, leaving dissolved salt behind as a solid residue — that is evaporation, not filtration, since the salt is dissolved, not suspended.
- Q7Medium
Milk is an example of:
A.Colloid✓ CorrectB.True solutionC.SuspensionD.CompoundAnswer: A. Colloid
Explanation: Milk is a colloid, an emulsion of tiny fat droplets dispersed in water, with particles too large for a true solution but too small to settle out like a suspension.
- Q8Medium
Which property is characteristic of compounds but not of mixtures?
A.Fixed composition by mass✓ CorrectB.Components keep their propertiesC.Can be separated physicallyD.Variable compositionAnswer: A. Fixed composition by mass
Explanation: Compounds always combine their elements in one fixed mass ratio, like H₂O's 1:8 hydrogen-to-oxygen ratio; mixtures can be blended in any proportion, which is what makes their composition variable.
- Q9Medium
Distillation separates two liquids when their:
A.Boiling points differ significantly✓ CorrectB.Densities differ greatlyC.Colours differD.Particles differ in sizeAnswer: A. Boiling points differ significantly
Explanation: Distillation works by heating a mixture until the liquid with the lower boiling point vaporises first, then condensing it separately — it needs a real gap in boiling point, not just differing densities or colours.
- Q10Medium
A solution containing 10 g salt in 90 g water has mass percentage of salt:
A.9%B.10%✓ CorrectC.11%D.100%Answer: B. 10%
Explanation: Mass percent of solute = (mass of solute ÷ total mass of solution) × 100. Here that's 10 ÷ (10 + 90) × 100 = 10%, using the full solution mass, not just the water.
- Q11Medium
Brass is a mixture of:
A.Copper and tinB.Aluminium and copperC.Iron and carbonD.Copper and zinc✓ CorrectAnswer: D. Copper and zinc
Explanation: Brass is an alloy, a homogeneous solid mixture of copper and zinc melted together, not a compound — the metals keep their individual properties and can be present in variable ratios.
- Q12Hard
The Tyndall effect (scattering of light) is observed in:
A.True solutionsB.Pure liquidsC.Colloids✓ CorrectD.Pure solidsAnswer: C. Colloids
Explanation: Colloidal particles, 1 nm to 1000 nm, are large enough to scatter a passing light beam, making its path visible — the Tyndall effect. True-solution particles are too small to do this.
- Q13Hard
Which of the following can be decomposed by chemical means?
A.IronB.OxygenC.GoldD.Water✓ CorrectAnswer: D. Water
Explanation: Water is a compound, and compounds can be broken down chemically — electrolysis splits H₂O into hydrogen and oxygen gas. Elements like iron, oxygen and gold cannot be decomposed further by chemical means.
- Q14Hard
To separate a mixture of sand, ammonium chloride and common salt, the correct sequence is:
A.Magnet, then crystalliseB.Filter, then distil, then sublimeC.Sublime NH₄Cl, dissolve salt in water, filter sand, evaporate filtrate✓ CorrectD.Centrifuge, then chromatographyAnswer: C. Sublime NH₄Cl, dissolve salt in water, filter sand, evaporate filtrate
Explanation: Ammonium chloride is removed first by sublimation since sand and salt do not sublime; water then dissolves the salt but not the sand, so filtering leaves sand behind, and evaporating the filtrate recovers the salt.
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Start this chapter free →Is Matter Around Us Pure? — FAQs
What are the key concepts in Class 9 Science Is Matter Around Us Pure??+
A pure substance has a fixed composition, while a mixture does not. This chapter separates mixtures from pure substances, distinguishes elements from compounds, classifies solutions, colloids and suspensions, and covers the standard separation techniques. Key ideas include Pure substance, Mixture, Homogeneous and heterogeneous mixtures, Element.
What does Class 9 Science Chapter 4 (Is Matter Around Us Pure?) cover on XamBaaz?+
It has 90 NCERT-based MCQs on "Is Matter Around Us Pure?": 30 Easy, 30 Medium and 30 Hard. Together they make 9 timed quizzes, and you never get the same set twice. Every question has an instant explanation. They help you prepare for CBSE Board exams and the JEE & NEET foundation years.
Are these "Is Matter Around Us Pure?" questions free to practise?+
Yes. Sign in with Google to practise "Is Matter Around Us Pure?" free. Full unlimited access is ₹999/year on a launch offer until 1 December 2026. No chapter is charged separately.
How should I revise "Is Matter Around Us Pure?" for the exam?+
Start with the Easy quiz to check your basics, then try Medium and Hard to practise applying them. There are 9 timed quizzes on this chapter, so you can come back for a fresh set instead of one you have seen. Read each explanation, retry the questions you miss, and track your accuracy until it stays high.
Are these "Is Matter Around Us Pure?" MCQs available with answers?+
Yes. 14 sample questions are shown here in full, each with the correct option and a step-by-step "Why" explanation. Sign in free with Google to start practising, with instant scoring.
Is there negative marking in the "Is Matter Around Us Pure?" quizzes?+
Yes. The timed quizzes use exam-style marking: +4 for a right answer, −1 for a wrong one and 0 for a skip. MHT-CET and CBSE board papers have no negative marking. Our mocks for those are scored their way.
What are the important questions from Is Matter Around Us Pure? (Class 9 Science)?+
The questions that matter most test Pure substance, Mixture, Homogeneous and heterogeneous mixtures, Element. This page shows 14 solved important MCQs with answers and explanations; all 90 questions on the chapter are available as timed quizzes once you sign in.
Is there an online quiz for Is Matter Around Us Pure??+
Yes — Class 9 Science Is Matter Around Us Pure? has timed online quizzes at Easy, Medium and Hard levels, with instant scoring and a worked explanation on every question. The first quiz on the chapter is free.