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NCERT Class 9 Science MCQ Chapter 5 Exploring Mixtures and their Separation
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Exploring Mixtures and their Separation
Chapter – 5
| MCQ |
Tick the Correct Options:
1. What is a well-stirred mixture of sugar and water called?
(a) Heterogeneous mixture.
(b) Homogeneous mixture.
(c) Suspension.
(d) Colloid.
Ans: (b) Homogeneous mixture.
2. Which of the following is an example of a heterogeneous mixture?
(a) Vinegar.
(b) Aerated drinks.
(c) Sand and water.
(d) Salt and water.
Ans: (c) Sand and water.
3. In a sugar and water solution, what is the sugar called?
(a) Solvent.
(b) Solute.
(c) Suspension.
(d) Colloid.
Ans: (b) Solute.
4. Which method is commonly used to express the concentration of solid heterogeneous mixtures like milk powder?
(a) Volume by volume percentage.
(b) Mass by volume percentage.
(c) Mass by mass percentage.
(d) Density by volume percentage.
Ans: (c) Mass by mass percentage.
5. Which method of expressing concentration is typically used when two miscible liquids are mixed?
(a) Mass by mass percentage.
(b) Mass by volume percentage.
(c) Volume by volume percentage.
(d) Weight by volume percentage.
Ans: (c) Volume by volume percentage.
6. A solution that cannot dissolve any more solute at a given temperature is called a:
(a) Dilute solution.
(b) Saturated solution.
(c) Unsaturated solution.
(d) Supersaturated solution.
Ans: (b) Saturated solution.
7. What generally happens to the solubility of a solid solute in a liquid solvent when the temperature increases?
(a) It decreases.
(b) It remains the same.
(c) It becomes zero.
(d) It increases.
Ans: (d) It increases.
8. What is a solid that is made up of particles arranged in a regular geometric pattern called?
(a) Liquid.
(b) Colloid.
(c) Crystal.
(d) Gas.
Ans: (c) Crystal.
9. Which process involves separating two miscible liquids by heating until the liquid with the lower boiling point vaporises?
(a) Evaporation.
(b) Sublimation.
(c) Distillation.
(d) Filtration.
Ans: (c) Distillation.
10. What is the minimum difference in boiling points required to effectively separate two miscible liquids using simple distillation?
(a) 10 °C.
(b) 15 °C.
(c) 25 °C.
(d) 50 °C.
Ans: (c) 25 °C.
11. Which method is used to separate different pigments present in the green extract of spinach leaves?
(a) Distillation.
(b) Centrifugation.
(c) Paper chromatography.
(d) Sublimation.
Ans: (c) Paper chromatography.
12. Liquids that do not mix with each other and form separate layers are called:
(a) Miscible liquids.
(b) Immiscible liquids.
(c) Solutions.
(d) Colloids.
Ans: (b) Immiscible liquids.
13. Which apparatus is best used to separate a mixture of mustard oil and water?
(a) Centrifuge.
(b) Distillation flask.
(c) Filter paper.
(d) Separating funnel.
Ans: (d) Separating funnel.
14. The transition of a solid directly into a vapour without passing through the liquid state is called:
(a) Deposition.
(b) Evaporation.
(c) Sublimation.
(d) Condensation.
Ans: (c) Sublimation.
15. Which of the following substances can undergo sublimation?
(a) Common salt.
(b) Sugar.
(c) Camphor.
(d) Sand.
Ans: (c) Camphor.
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