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1

AIPMT 2007

MCQ (Single Correct Answer)
The Langmuir adsorption isotherm is deduced using the assumption
A
the adsorption sites are equivalent in their ability to adsorb the particles
B
the heat of adsorption varies with coverage
C
the adsorbed molecules interact with each other
D
the adsorption takes place in multilayers.

Explanation

Langmuir adsorption isotherm is based on the assumption that every adsorption site is equivalent and that the ability of a particle to bind there is independent of whether nearby sites are occupied or not occupied.
2

AIPMT 2006

MCQ (Single Correct Answer)
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.
3

AIPMT 2005

MCQ (Single Correct Answer)
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).

4

AIPMT 2004

MCQ (Single Correct Answer)
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.

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