Class 9 • Chemistry • Chapter 2
Is Matter Around Us Pure
True & False Quiz
Pure. Mix. Separate.
✓True
✗False
25
Questions
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Ch.2
Chapter
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IX
Class
Why True & False for Is Matter Around Us Pure?
How this format sharpens your conceptual clarity
🔵 This chapter builds the conceptual framework to classify all matter — pure substances vs mixtures, and the methods to separate them.
✅ T/F tests differences between solutions, colloids, and suspensions; methods of separation; and properties of pure substances.
🎯 An alloy is a MIXTURE (not a pure substance) — brass (Cu+Zn) and steel (Fe+C) are homogeneous mixtures, not compounds.
📋
Read each statement carefully. Click True or False — instant feedback with explanation appears. Submit anytime; unattempted questions are marked Skipped.
Q 1
A pure substance contains only one type of particle.
Q 2
Mixtures can have variable composition.
Q 3
Air is a pure substance.
Q 4
Salt dissolved in water forms a homogeneous mixture.
Q 5
A compound can be separated by physical methods.
Q 6
Alloys are mixtures.
Q 7
In a suspension, particles settle down on standing.
Q 8
Elements and compounds are both considered pure substances.
Q 9
Mixtures always have fixed boiling and melting points.
Q 10
Filtration can separate salt from water.
Q 11
Colloids are heterogeneous in appearance.
Q 12
Components of a mixture retain their properties.
Q 13
Evaporation is suitable for separating volatile solutes from non-volatile solvents.
Q 14
Sugar is a compound.
Q 15
Milk is an example of a solution.
Q 16
A homogeneous mixture has the same composition throughout.
Q 17
Suspension particles are too small to be seen without a microscope.
Q 18
A solution always contains a solute and a solvent.
Q 19
Tap water is a pure substance.
Q 20
Distillation is a process meant for separating mixtures based on boiling points.
Q 21
All mixtures are either homogeneous or heterogeneous.
Q 22
Sand in water forms a suspension.
Q 23
A compound contains elements combined in a fixed proportion.
Q 24
Mixtures always have uniform appearance.
Q 25
Physical methods can separate the components of a mixture.
Key Takeaways — Is Matter Around Us Pure
Core facts for CBSE Boards & exams
1
Pure substance: fixed composition (element or compound); mixture: variable composition.
2
Homogeneous mixture (solution): uniform throughout; Heterogeneous mixture: non-uniform.
3
Solution: solute + solvent; concentration = (solute mass / solution mass) × 100.
4
Colloid: particle size 1–100 nm, shows Tyndall effect; Suspension: >100 nm, settles on standing.
5
Separation methods: evaporation, distillation, fractional distillation, chromatography, centrifugation.
6
Tyndall effect: scattering of light by colloidal particles — distinguishes colloid from true solution.