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1

AIPMT 2001

MCQ (Single Correct Answer)
Which is not correct regarding the adsorption of a gas on surface of a solid?
A
On increasing temperature adsorption increases continuously.
B
Enthalpy and entropy change is negative.
C
Adsorption is more for some specific substance.
D
It is a reversible reaction.

Explanation

Adsorption is the property of a substance to hold or to concentrate liquid or dissolved substances upon its surface. Solids adsorb greater amount of substance at lower temperature and in general adsorption decreases with increasing temperature.
2

AIPMT 2000

MCQ (Single Correct Answer)
Which one of the following method is commonly used method for destruction of colloid?
A
Dialysis
B
Condensation
C
Filteration by animal membrane
D
By adding electrolyte

Explanation

By adding electrolytes the colloidal particles are precipitated. The electrolytes neutralise the charge of colloids leading to their coagulation and thus destroy the colloid.

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