Discussion
A short length of uncoated tubing fitted before the analytical column is a ______ column.
Answer: B
This is a guard column, sacrificed to catch involatile residues that would foul the analytical column. Capillary and packed describe the analytical column's construction, and a reference column belongs to a dual-channel thermal conductivity detector. Naming a component after the job it does rather than what it is made of makes a schematic self-explanatory.
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