Separation Techniques Practice Questions
WAEC (West Africa) · WAEC Chemistry · 149 free MCQs with instant results and detailed explanations.
149
Total
44
Easy
75
Medium
30
Hard
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Sample Questions from Separation Techniques
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Q1
Easy
Which of the following separation techniques is best suited for separating a mixture of sand and salt?
A.
Filtration
B.
Distillation
C.
Chromatography
D.
Centrifugation
Show Answer & Explanation
Correct Answer: A
Filtration is ideal for separating solid particles from liquids. In this case, sand (solid) can be separated from salt (dissolved in water) using filtration.
Q2
Easy
What method would you use to separate a colored dye from water?
A.
Evaporation
B.
Filtration
C.
Chromatography
D.
Sublimation
Show Answer & Explanation
Correct Answer: C
Chromatography is the most effective technique for separating colored substances due to differences in their movement through a medium.
Q3
Easy
In which separation technique do components of a mixture separate based on their densities?
A.
Filtration
B.
Centrifugation
C.
Evaporation
D.
Simple Distillation
Show Answer & Explanation
Correct Answer: B
Centrifugation separates components of a mixture by spinning them at high speeds, which causes denser substances to settle at the bottom.
Q4
Medium
Which of the following methods is most effective for separating a mixture of salt and sand?
A.
Filtration
B.
Evaporation
C.
Distillation
D.
Chromatography
Show Answer & Explanation
Correct Answer: A
Filtration is effective because it allows sand to be trapped in the filter paper while the salt solution passes through, effectively separating the two substances.
Q5
Medium
A student wants to separate a mixture of colored dyes in a solution. Which technique should be used?
A.
Filtration
B.
Evaporation
C.
Distillation
D.
Chromatography
Show Answer & Explanation
Correct Answer: D
Chromatography is the best technique for separating colored dyes because it relies on the different affinities of substances to a stationary phase, allowing for effective separation.
Q6
Medium
During fractional distillation, which property of the components of a mixture is primarily utilized?
A.
Solubility
B.
Melting point
C.
Boiling point
D.
Density
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Correct Answer: C
Fractional distillation separates components based on their different boiling points, allowing for effective separation of liquids with varying volatility.
Q7
Medium
What is the primary difference between simple distillation and fractional distillation?
A.
Temperature requirement
B.
Number of components separated
C.
Type of apparatus used
D.
Nature of the mixture
Show Answer & Explanation
Correct Answer: B
The primary difference is that simple distillation is used for separating a single component from a mixture, whereas fractional distillation is used for separating multiple components based on differing boiling points.
Q8
Hard
Which of the following separation techniques is best suited for separating a mixture of oil and water?
A.
Filtration
B.
Distillation
C.
Separating funnel
D.
Evaporation
Show Answer & Explanation
Correct Answer: C
A separating funnel effectively separates immiscible liquids like oil and water due to their different densities, making it the most suitable technique.
Q9
Hard
In the process of fractional distillation, what primarily allows for the separation of substances in a mixture?
A.
Differences in solubility
B.
Differences in boiling points
C.
Differences in density
D.
Differences in mass
Show Answer & Explanation
Correct Answer: B
Fractional distillation separates substances based on their differences in boiling points, allowing for effective separation of components in a liquid mixture.
Q10
Hard
Which of the following separation techniques is most suitable for purifying a liquid mixture containing a volatile solute and a non-volatile solute?
A.
Distillation
B.
Filtration
C.
Centrifugation
D.
Chromatography
Show Answer & Explanation
Correct Answer: A
Distillation is the best technique for separating a volatile solute from a non-volatile solute in a liquid mixture because it relies on the differences in boiling points. The volatile solute evaporates and can be condensed back into a liquid, effectively purifying the mixture.
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Separation Techniques — WAEC (West Africa) WAEC Chemistry Practice Questions Online
This page contains 149 practice MCQs for the chapter Separation Techniques in WAEC (West Africa) WAEC Chemistry. The questions are organized by difficulty — 44 easy, 75 medium, 30 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.