Class 12 Chemistry · Chapter 12 · Test 2
Gas Chromatography
40 MCQs
40 questions · 35 min · 40 marks
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Sample questions
The first 5 of 40. Try each one, then tap to see the answer.
Question 1
Gas chromatography is used to separate:
- AGases and volatile liquids and solids in gaseous form
- BOnly solids
- COnly proteins
- DOnly ions in solution
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Answer: A
The sample must be vaporised.
Question 2
The stationary phase in GC is:
- AAn inert gas
- BA non-volatile long-chain non-polar hydrocarbon liquid on silica or alumina particles
- CWater in paper
- DAlumina powder only
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Answer: B
The liquid is bonded to small particles of silica or alumina.
Question 3
The mobile phase in GC is:
- AA polar liquid
- BA solid
- CAn inert carrier gas such as helium or nitrogen
- DWater
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Answer: C
The carrier gas carries the vapours through the column.
Question 4
What is the role of the carrier gas in gas chromatography?
- ATo react with the sample
- BTo act as stationary phase
- CTo carry vaporised sample through the column
- DTo detect the substances
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Answer: C
It moves the vapourised sample along the column.
Question 5
Why must the stationary phase in GC have a high boiling point?
- ATo evaporate quickly
- BTo increase pressure
- CTo remain in liquid form during the process
- DTo react with gases
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Answer: C
It must not vaporise in the hot column.
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