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1
AIEEE 2009
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Which of the following statements is incorrect regarding physisorptions ?
A
It occurs because of vander Waal’s forces.
B
More easily liquefiable gases are adsorbed readily.
C
Under high pressure it results into multi molecular layer on adsorbent surface.
D
Enthalpy of adsorption ($$\Delta H_{adsorption}$$ ) is low and positive
2
AIEEE 2008
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005, respectively. The correct order of their protective powers is
A
D < A < C < B
B
C < B < D < A
C
A < C < B < D
D
B < D < A < C
3
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
In Langmuir’s model of adsorption of a gas on a solid surface
A
the rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered
B
the adsorption at a single site on the surface may involve multiple molecules at the same time
C
the mass of gas striking a given area of surface is proportional to the pressure of the gas
D
the mass of gas striking a given area of surface is independent of the pressure of the gas
4
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively, which of the following statements is NOT correct?
A
magnesium chloride solution coagulates, the gold sol more readily than the iron (III) hydroxide sol.
B
sodium sulphate solution causes coagulation in both sols
C
mixing the sols has no effect
D
coagulation in both sols can be brought about by electrophoresis
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