Gas Chromatography
Which of the following are not used as stationary phases in a GC column?

Silica
Polysiloxanes
Cyclodextrins
None are used as stationary phases

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Gas Chromatography
In column switching chromatography

compounds trapped on one column are eluted to another column
the flow to the column is switched on and off repeatedly
any of the above
one column is removed and replaced by another

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Gas Chromatography
Resolution is proportional to the

cube root of the number of theoretical plates in a column
number of theoretical plates in a column
square of the number of theoretical plates in a column
square root of the number of theoretical plates in a column

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