Q. Pick out the wrong statement.

(A) With decrease in feed temperature, the number of plates required for binary distillation decreases for a given ‘L/V’ ratio

(B) The extraction per unit of total height for a short packed column is more effective than for a tall column, in case of liquid-liquid extraction

(C) Natural draft cooling towers are made of ferroconcrete and its cross-section is wider at the bottom

(D) Vander wall adsorption is also called chemisorption