Discussion
What distinguishes a capillary column from a packed one?
Answer: C
A capillary is an open tube whose inner wall carries a thin film, leaving the centre clear, while a packed column is filled with coated particles. The absence of a packed bed removes the eddy diffusion term entirely and permits far greater lengths at modest pressure. That one structural change removes a whole term from the van Deemter equation is why capillary columns displaced packed ones for nearly all work. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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