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Mass Transfer - Engineering

Q1:

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 ferro-concrete and its cross-section is wider at the bottom.

D Vanderwall adsorption is also called chemisorption.

ANS:D - Vanderwall adsorption is also called chemisorption.

The wrong statement is: "Vanderwall adsorption is also called chemisorption." Van der Waals adsorption, also known as physisorption, involves the adsorption of molecules onto a surface through weak van der Waals forces, such as London dispersion forces or dipole-dipole interactions. It does not involve chemical bonds forming between the adsorbate and the adsorbent, as is the case in chemisorption. So, the correct statement would be: "Van der Waals adsorption is also called physisorption."