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The number of theoretical stages, depends on the

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in Cytogenetics by (54.1k points)
The number of theoretical stages, depends on the

(a) Stepping off the tray

(b) Reflux ratio

(c) Operating line

(d) Flow rates

The question was posed to me in an international level competition.

Question is taken from Minimum Stages topic in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design

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Right choice is (b) Reflux ratio

The explanation: The number of theoretical stages depends on the reflux ratio R = L0/D, while the reflux ratio itself depends upon the operating line.

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