Degree of freedom increases, as A. Reflux increases B. Purity

Question

Degree of freedom increases, as A. Reflux increases B. Purity decreases C. Purity increases D. Reflux decreases This question was posed to me during an interview. This is a very interesting question from Problems When Setting Simulation Input in portion Rigorous Distillation Calculations of Distillation Design

fahmy · Accepted Answer

The correct answer is C. Purity increases The best explanation: Degree of freedom increases as Purity increases, as they are ditrectly proportional also this can be related using phase rule F =C –P+2.