$4.$The McCabeThiele method is particularly useful for:

a$)$ Designing binary distillation columns

b$)$ Analyzing ternary distillation systems

c$)$ Estimating the optimum reflux ratio

d$)$ Calculating the minimum reflux ratio

The Frasch process for extracting sulphur from underground deposits primarily utilizes which of the following to melt the sulphur?

A$)$ Compressed air

B$)$ Superheated water

C$)$ Liquid nitrogen

D$)$ Carbon dioxide

Refining of Edible Oils $($Extended$)$

The process used to remove free fatty acids from crude oil is called:

A$)$ Winterization

B$)$ Deodorization

C$)$ Neutralization

D$)$ Bleaching

Manufacture of Sugar $($Extended$)$

Molasses, a by$-$product of sugar production, is primarily used for:

A$)$ Fermentation to produce ethanol

B$)$ Direct consumption as a sweetener

C$)$ As a feedstock in the production of bioplastics

D$)$ Purification of crude oil