1
MCQ (Single Correct Answer)

AIPMT 2002

Position of non polar and polar part in micelle
A
polar at outer surface but non polar at inner surface
B
polar at inner surface non polar at outer surface
C
distributed over all the surface
D
are present in the surface only.

Explanation

Micelles are formed by the association of colloids. They are formed by lyophilic and lyophobic groups. As the concentration increases the lyophobic parts receding away from the solvent approach each other are forms a cluster, the lyophobic ends are in the interior, lyophilic groups projecting outwards in contact with the solvent.
2
MCQ (Single Correct Answer)

AIPMT 2001

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.
3
MCQ (Single Correct Answer)

AIPMT 2000

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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