Fenske equation for determining the minimum number of theoretical stages in distillation column holds good, when the_________________?
Correct answer: C. Relative volatility is reasonably constant
- A. Mixture (to be separated) shows positive deviation from ideality
- B. Mixture (to be separated) shows negative deviation from ideality
- C. Relative volatility is reasonably constant
- D. Multi-component distillation is involved
Explanation
The Fenske relation estimates the minimum stages at total reflux using relative volatilities, commonly treating them as reasonably constant. Multicomponent systems can also use Fenske, so being multicomponent is not the defining condition here.
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