Order Langmuir adsorption isotherm

Order Langmuir adsorption isotherm
31. When As2
S3
sol and Fe(OH)3
sol are mixed
(a) both become dilute (b) both become more stable
(c) both become true solutions (d) mutual coagulation takes place
32. Which of the following is an example of heterogeneous catalysis?
(a) Decomposition of H2
O2
solution in presence of KI (b) Lead chamber process for the manufacture of H2
SO4
(c) MnO2
in the decomposition of KClO3 (d) Hydrolysis of ethyl acetate in presence of dilute H2
SO4
33. Example of a shape selective catalyst is
(a) Zeolite (b) Spongy iron (c) V2
O5
(d) Pyrolusite
34. The greater the Brownian motion in a sol, greater the stability because
(a) entropy decreases (b) aggregation is prevented
(c) dispersed phase and the medium are stable (d) kinetic energy of molecules are high
35. NH3
is adsorbed more quickly than N2
or H2
because
(a) it has pyramidal structure
(b) NH3
is a compound and others are elements
(c) NH3
has higher van der Waals forces of attraction
(d) NH3
is basic and reactive while N2
and H2
are comparatively inert.
Order Langmuir adsorption isotherm
36. Rate of the process does not show any significant change with time in the case of
(a) absorption (b) chemisorption (c) physisorption (d) all sorption processes
37. Among the following, the compound capable of forming micelles in water is
(a) sodium palmitate (b) sodium benzoate (c) glucose (d) potassium oxalate
38. The quantity of gas adsorbed by a finely divided adsorbent like charcoal increases with
(a) increase in temperature and decrease in pressure (b) decrease in temperature and increase in pressure
(c) decrease in temperature and decrease in pressure (d) increase in temperature and increase in pressure
39. The critical temperature of SO2, CO2 and NH3 are 157°C, 31°C and 133°C respectively. The volumes of the gases (V)
adsorbed by a given mass of adsorbent under similar conditions of temperature and pressure are in the order
(a) 2 32
VV V SO NH CO ! ! (b) CO NH SO 2 32
VVV ! ! (c) NH SO CO 32 2
V VV ! ! (d) NH CO SO 3 22
VVV ! !
40. The activation energy requirement for physisorption is much less than that for chemisorption because physisorption
(a) occurs with decrease in free energy (b) does not involve chemical bond formation
(c) is an exothermic process (d) proceeds with decrease in entropy
41. During an adsorption process, gas molecules are adsorbed appreciably at all temperatures. This is expected to be
(a) reversible (b) highly specific
(c) trimolecular layered (d) having low activation energy for desorption
42. Among the following colloidal solutions, more scattering of light is observed for
(a) gum (b) soap (c) proteins (d) ferric hydroxide

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