1
MCQ (Single Correct Answer)

AIPMT 2006

A plot of log(x/m) versus log p for the adsorption of a gas on a solid gives a straight line with slope equal to
A
log K
B
$$-$$ log K
C
n
D
1/n

Explanation

According to Freundlich adsorption isotherm, in the median range of pressure

       $${x \over m} \propto {P^{{1 \over n}}}$$

$$ \Rightarrow $$  $${x \over m}$$ = kP$$^{{1 \over n}}$$

taking log both sides, we get,

log$${x \over m}$$ = logk + $${1 \over n}$$ logP

Here in graph between log$${x \over m}$$ and logP, slope is $${1 \over n}$$ and intercepts = log k.
2
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).

3
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.
4
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.

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