We have included 30 MCQs for Chapter 5 of the NCERT book. In this ‘Exploring Mixtures and their Separation’ Chemistry chapter, we have, along with MCQ questions.
Lets have a look at some of the primary points that will help you to scan the chapter quickly –
- Mixtures classified as homogeneous and heterogeneous.
- Solutions contain solute and solvent.
- Concentration measures dissolved solute amount.
- Concentration expressed as % m/m, % m/v, % v/v.
- Solubility depends on temperature.
- Saturated solutions cannot dissolve more solute.
- Solubility curves represent solubility-temperature relationships.
- Crystallization separates and purifies solid substances.
- Crystals form from saturated solutions on cooling.
- Distillation separates miscible liquids by boiling points.
- Fractional distillation separates petroleum components.
- Paper chromatography separates coloured mixture components.
- Separating funnel separates immiscible liquids.
- Sublimation separates sublimable solids from mixtures.
- Centrifugation helps in separating suspended particles from liquids.
35 MCQ Questions for Class 9 Science: Chapter 5 Exploring Mixtures and their Separation
Question 1. A solution is always a ______ mixture.
a) Heterogeneous
b) Homogeneous
c) Mechanical
d) Colloidal
Answer:
b) Homogeneous — Uniform composition throughout.
Question 2. Which mixture is homogeneous?
a) Sand and water
b) Oil and water
c) Sugar and water
d) Chalk and water
Answer:
c) Sugar and water — Solute dissolves completely.
Question 3. In a sugar solution, sugar is the:
a) Solvent
b) Solute
c) Suspension
d) Medium
Answer:
b) Solute — Substance being dissolved.
Question 4. In a sugar solution, water is the:
a) Solute
b) Solvent
c) Residue
d) Filtrate
Answer:
b) Solvent — Dissolves the solute.
Question 5. Which is a heterogeneous mixture?
a) Vinegar
b) Soda water
c) Salt solution
d) Sand and water
Answer:
d) Sand and water — Visible separate phases.
Question 6. Concentration refers to:
a) Total solution volume
b) Solvent quantity only
c) Dissolved solute amount
d) Solution colour
Answer:
c) Dissolved solute amount — Relative to solution/solvent.
Question 7. Mass by mass percentage indicates:
a) g solute per 100 mL
b) mL solute per 100 mL
c) g solute per 100 g
d) mL solvent per 100 g
Answer:
c) g solute per 100 g — Uses total solution mass.
Question 8. A 5% glucose solution usually represents:
a) % v/v
b) % m/v
c) % m/m
d) ppm
Answer:
b) % m/v — Common medical concentration.
Question 9. Volume by volume percentage is used for:
a) Solid-solid mixtures
b) Solid-liquid mixtures
c) Miscible liquids
d) Suspensions
Answer:
c) Miscible liquids — Both measured by volume.
Question 10. Solubility is defined at a:
a) Fixed pressure only
b) Fixed temperature
c) Fixed colour
d) Fixed volume only
Answer:
b) Fixed temperature — Solubility varies with temperature.
Question 11. A saturated solution:
a) Dissolves unlimited solute
b) Cannot dissolve more solute
c) Contains no solvent
d) Is always dilute
Answer:
b) Cannot dissolve more solute — At given temperature.
Question 12. Solubility of most solids in liquids:
a) Decreases with temperature
b) Remains constant
c) Increases with temperature
d) Becomes zero
Answer:
c) Increases with temperature — Common trend.
Question 13. Solubility of gases in liquids generally:
a) Increases with temperature
b) Decreases with temperature
c) Doubles always
d) Never changes
Answer:
b) Decreases with temperature — Gas escapes easier.
Question 14. A graph showing solubility versus temperature is:
a) Pie chart
b) Bar graph
c) Solubility curve
d) Histogram
Answer:
c) Solubility curve — Shows temperature dependence.
Question 15. Crystallization is mainly used for:
a) Mixing substances
b) Purifying solids
c) Heating gases
d) Measuring density
Answer:
b) Purifying solids — Produces pure crystals.
Question 16. Crystals are solids with:
a) Random arrangement
b) No structure
c) Regular particle arrangement
d) Liquid structure
Answer:
c) Regular particle arrangement — Geometric pattern present.
Question 17. Copper sulfate crystals are usually:
a) Red
b) Green
c) Blue
d) Yellow
Answer:
c) Blue — Characteristic crystal colour.
Question 18. Slow cooling during crystallization produces:
a) Smaller crystals
b) Larger crystals
c) No crystals
d) Powder only
Answer:
b) Larger crystals — Particles arrange better.
Question 19. Distillation separates liquids based on:
a) Colour difference
b) Density difference
c) Boiling point difference
d) Shape difference
Answer:
c) Boiling point difference — Vapour forms first.
Question 20. In distillation, vapours are converted back by:
a) Heating
b) Cooling
c) Filtration
d) Stirring
Answer:
b) Cooling — Condensation occurs.
Question 21. Acetone boils at approximately:
a) 25°C
b) 56°C
c) 78°C
d) 100°C
Answer:
b) 56°C — Lower than water.
Question 22. Water boils at:
a) 50°C
b) 75°C
c) 100°C
d) 125°C
Answer:
c) 100°C — Standard boiling point.
Question 23. Fractional distillation is used when boiling points differ:
a) Greatly
b) Less than 25°C
c) More than 100°C
d) Not at all
Answer:
b) Less than 25°C — Close boiling points.
Question 24. LPG is obtained from:
a) Crystallization
b) Filtration
c) Fractional distillation
d) Sublimation
Answer:
c) Fractional distillation — Petroleum refining process.
Question 25. Paper chromatography separates substances based on:
a) Particle size only
b) Colour only
c) Movement with solvent
d) Magnetism
Answer:
c) Movement with solvent — Different interaction rates.
Question 26. In paper chromatography, solvent level should be:
a) Above sample spot
b) At sample spot
c) Below sample spot
d) Irrelevant
Answer:
c) Below sample spot — Prevents sample dissolution.
Question 27. Oil and water are:
a) Miscible liquids
b) Solids
c) Immiscible liquids
d) Gases
Answer:
c) Immiscible liquids — Form separate layers.
Question 28. Immiscible liquids are separated using:
a) Beaker
b) Funnel
c) Separating funnel
d) Test tube
Answer:
c) Separating funnel — Layer-wise collection.
Question 29. In mustard oil-water mixture, oil forms:
a) Lower layer
b) Upper layer
c) Middle layer
d) No layer
Answer:
b) Upper layer — Lower density than water.
Question 30. Camphor can be separated from sand by:
a) Filtration
b) Distillation
c) Sublimation
d) Sedimentation
Answer:
c) Sublimation — Direct solid-to-vapour change.
Question 31. Sublimation is:
a) Solid to liquid
b) Liquid to gas
c) Solid to vapour
d) Gas to liquid
Answer:
c) Solid to vapour — No liquid stage.
Question 32. Reverse of sublimation is called:
a) Condensation
b) Melting
c) Evaporation
d) Deposition
Answer:
d) Deposition — Vapour directly becomes solid.
Question 33. Dry ice is:
a) Frozen oxygen
b) Solid carbon dioxide
c) Solid nitrogen
d) Frozen water
Answer:
b) Solid carbon dioxide — Sublimes readily.
Question 34. Suspensions contain particles that are:
a) Invisible
b) Dissolved completely
c) Visible to naked eye
d) Molecular size
Answer:
c) Visible to naked eye — Larger particles.
Question 35. Centrifugation separates mixtures by:
a) Magnetic force
b) Centrifugal force
c) Electric current
d) Gravity only
Answer:
b) Centrifugal force — Rapid spinning separates particles.
10 True and False Questions for Chapter 5 Exploring Mixtures and their Separation
Question 1. A solution is a homogeneous mixture. (True/False)
Answer:
True
Question 2. Sand and water form a homogeneous mixture. (True/False)
Answer:
False
Question 3. Solubility generally increases with temperature for solids. (True/False)
Answer:
True
Question 4. A saturated solution can dissolve unlimited solute. (True/False)
Answer:
False
Question 5. Crystallization helps purify solid substances. (True/False)
Answer:
True
Question 6. Distillation separates substances using boiling points. (True/False)
Answer:
True
Question 7. Oil and water are miscible liquids. (True/False)
Answer:
False
Question 8. Paper chromatography can separate coloured components. (True/False)
Answer:
True
Question 9. Camphor can be separated by sublimation. (True/False)
Answer:
True
Question 10. Centrifugation uses rapid spinning for separation. (True/False)
Answer:
True
10 Fill in the Blanks Questions for Chapter 5 Exploring Mixtures and their Separation
Question 1. A homogeneous mixture of solute and solvent is called a __________.
Answer:
Solution
Question 2. The substance that dissolves is the __________.
Answer:
Solute
Question 3. The substance that dissolves the solute is the __________.
Answer:
Solvent
Question 4. A solution that cannot dissolve more solute is __________.
Answer:
Saturated
Question 5. The graphical representation of solubility is a __________ curve.
Answer:
Solubility
Question 6. The process of obtaining pure crystals is called __________.
Answer:
Crystallization
Question 7. Separation based on boiling points is called __________.
Answer:
Distillation
Question 8. Oil and water can be separated using a __________ funnel.
Answer:
Separating
Question 9. Direct conversion of solid to vapour is called __________.
Answer:
Sublimation
Question 10. Rapid spinning used for separation is called __________.
Answer:
Centrifugation
Question on Match the Columns
Unmatched Columns – Questions
| Column A | Column B |
|---|---|
| (i) Solute | (a) Separates immiscible liquids |
| (ii) Solvent | (b) Substance being dissolved |
| (iii) Crystallization | (c) Purification by crystal formation |
| (iv) Distillation | (d) Substance that dissolves solute |
| (v) Separating Funnel | (e) Separation using boiling points |
| (vi) Sublimation | (f) Direct solid to vapour change |
Matched Columns – Answer
| Column A | Column B |
|---|---|
| (i) Solute | (b) Substance being dissolved |
| (ii) Solvent | (d) Substance that dissolves solute |
| (iii) Crystallization | (c) Purification by crystal formation |
| (iv) Distillation | (e) Separation using boiling points |
| (v) Separating Funnel | (a) Separates immiscible liquids |
| (vi) Sublimation | (f) Direct solid to vapour change |
Related Class 9 Chemistry Chapters
Mixtures lead straight into what matter is made of:
- Atomic Foundations of Matter MCQs – elements, compounds and atoms.
- Journey Inside the Atom MCQs – the structure behind every substance.
- Earth as a System MCQs – air, water and soil are natural mixtures.
Next chapter: Chapter 6 – How Forces Affect Motion
See all chapters: MCQ Questions for Class 9 Science – All 13 Chapters
