1
MCQ (Single Correct Answer)

AIPMT 2005

Which one of the following forms micelles in aqueous solution above certain concentration?
A
Dodecyl trimethyl ammonium chloride
B
Glucose
C
Urea
D
Pyridinium chloride

Explanation

Dodecyl trimethyl ammonium chloride is a cationic surfactant and forms micelles in aqueous solution above critical micelle concentration (CMC).

2
MCQ (Single Correct Answer)

AIPMT 2004

The enzyme which hydrolyses triglycerides to fatty acids and glycerol is called
A
maltase
B
lipase
C
zymase
D
pepsin

Explanation

Triglycerides are lipids, hence these are hydrolysed by lipases to glycerol and fatty acids.
3
MCQ (Single Correct Answer)

AIPMT 2003

According to the adsorption theory of catalysis, the speed of the reaction increases because
A
the concentration of reactant molecules at the active centres of the catalyst becomes high due to adsorption
B
in the process of adsorption , the activation energy of the molecules becomes large
C
adsorption produces heat which increases the speed of the reaction
D
adsorption lowers the activation energy of the reaction.

Explanation

The speed of the reaction increases because adsorption lowers the activation energy of the reaction.
4
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.

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