Class 11 Chemistry · Chapter 15 · Test 1
Separation and Purification
This test covers Filtration, Crystallization, Distillation, Chromatography, Paper Chromatography and Checking the Purity of a Product.
36 questions · 25 min · 36 marks
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Sample questions
The first 5 of 36. Try each one, then tap to see the answer.
Question 1
After the crystals are formed, they are typically separated from the mother liquor by:
- AEvaporation
- BDecantation or filtration
- CSublimation
- DDistillation
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Answer: B
When crystallization is complete, the mixture of crystals and mother liquor is filtered (e.g. through a Gooch crucible using a vacuum pump).
Question 2
The comparative rates at which the solutes move in paper chromatography depend on:
- ASize of filter paper
- BRf values of solutes
- CTemperature
- DSize of the chromatographic jar
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Answer: B
Each component has its own specific Rf value, so different components move at different rates.
Question 3
The method that can be used to separate two solid compounds with different solubilities in a solvent is:
- ADistillation
- BIsolation
- CCrystallization
- DFiltration
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Answer: C
Crystallization is based on the solute being soluble in a suitable solvent at high temperature and being thrown out as crystals on cooling.
Question 4
It is suspected that a hand-written legal document has been changed by overwriting some crucial figures. Which technique will you use to check the inks used at suspected places?
- ADistillation
- BChromatography
- CSolvent Extraction
- DCrystallization
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Answer: B
Chromatography is very useful for identifying complicated chemicals such as dyes, drugs and pesticides.
Question 5
In chromatography, the components of the mixture are separated based on:
- ATheir molecular masses
- BThe interaction of the components with stationary as well as mobile phases
- CThe type of solvent used
- DThe filter paper used
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Answer: B
Chromatography involves the distribution of a solute between a stationary phase and a mobile phase, so separation depends on interaction with both.
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