Separation Techniques — Homi Bhabha Class 9 Chemistry MCQs with Solutions
Free Homi Bhabha Class 9 Chemistry Separation Techniques MCQs with step-by-step solutions (10 questions). Part of Matter & Its States. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Separation Techniques · medium · theory
The method used to separate an insoluble solid from a liquid is:
A. distillation
B. chromatography
C. evaporation
D. filtration ✓ Correct
Solution: Filtration traps insoluble solids on the filter while the liquid passes through.
Q2 — Separation Techniques · medium · theory
Common salt can be recovered from its solution in water by:
A. filtration
B. evaporation ✓ Correct
C. magnetic separation
D. sublimation
Solution: Evaporating the water leaves behind the dissolved salt as a solid.
Q3 — Separation Techniques · hard · theory
Two miscible liquids with different boiling points (e.g. water and alcohol) are best separated by:
A. filtration
B. decantation
C. hand-picking
D. distillation ✓ Correct
Solution: Distillation vaporises the more volatile liquid, which is then condensed and collected separately.
Q4 — Separation Techniques · hard · theory
The technique used to separate the different coloured dyes present in ink is:
A. filtration
B. winnowing
C. chromatography ✓ Correct
D. evaporation
Solution: Chromatography separates components (dyes) that travel different distances on a medium.
Q5 — Separation Techniques · medium · theory
A mixture of iron filings and sulphur powder can be separated using:
A. a magnet ✓ Correct
B. a filter paper
C. evaporation
D. a sieve only
Solution: Iron is magnetic and can be picked out with a magnet, leaving the sulphur behind.
Q6 — Separation Techniques · hard · theory
A mixture of common salt and camphor is best separated by:
A. magnetic separation
B. filtration
C. decantation
D. sublimation ✓ Correct
Solution: Camphor sublimes on heating and can be collected, while the salt is left behind.
Q7 — Separation Techniques · easy · theory
Which method is most suitable to separate sand from water?
A. Filtration ✓ Correct
B. Distillation
C. Chromatography
D. Sublimation
Solution: Sand is insoluble in water, so it stays behind on the filter paper while the water passes through. This makes filtration the correct method.
Q8 — Separation Techniques · medium · theory
To obtain pure water from a solution of common salt in water, the most suitable method is
A. filtration
B. sedimentation
C. distillation ✓ Correct
D. decantation
Solution: Salt is dissolved, so filtration, sedimentation and decantation cannot remove it. Distillation boils the water to vapour and condenses it back, leaving the salt behind and giving pure water.
Q9 — Separation Techniques · medium · theory
A mixture contains common salt, sand and iron filings. Which sequence of methods best separates all three?
A. Use a magnet, then add water and filter, then evaporate the filtrate ✓ Correct
B. Use distillation first and then a magnet
C. Use sublimation first and then filtration
D. Use filtration alone on the dry mixture
Solution: A magnet removes the iron filings first. Adding water dissolves the salt but not the sand, so filtering removes the sand. Finally, evaporating the salt solution (filtrate) leaves the salt behind.
Q10 — Separation Techniques · hard · theory
Acetone (boiling point 56 degrees C) and water (boiling point 100 degrees C) are miscible with each other. The correct method to separate them, with the correct reason, is
A. A separating funnel, because the two liquids are immiscible and form layers
B. Distillation, because the two liquids have sufficiently different boiling points and acetone vaporises first ✓ Correct
C. Filtration, because acetone is insoluble and stays on the filter paper
D. Sublimation, because acetone changes directly from liquid to solid
Solution: Two miscible liquids whose boiling points differ enough are separated by distillation. On heating, acetone (lower boiling point) vaporises first and is condensed and collected, leaving water behind.