1
AIEEE 2006
+4
-1
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
2
AIEEE 2005
+4
-1
The volume of a colloidal particle, VC as compared to the volume of a solute particle in a true solution VS, could be
A
$${V_C \over V_S } \simeq 1$$
B
$${V_C \over V_S } \simeq 10^{-3}$$
C
$${V_C \over V_S } \simeq 10^3$$
D
$${V_C \over V_S } \simeq 10^{23}$$
3
AIEEE 2005
+4
-1
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
4
AIEEE 2003
+4
-1
Which one of the following characteristics is not correct for physical adsorption?
A
Adsorption increases with increase in temperature
B
C
Both enthalpy and entropy of adsorption are negative
D
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