SURFACE CHEMISTRY EAMCET MCQ’S
1. Which of the following
process does not occur at the interface of phases?
(i)
crystallisation
(ii)
heterogenous catalysis
(iii)
homogeneous catalysis
(iv)
corrosion
2. At the equilibrium
position in the process of adsorption ___________.
(i)
ΔH > 0
(ii)
ΔH = TΔS
(iii)
ΔH > TΔS
(iv)
ΔH < TΔS
3. Which of the following
interface cannot be obtained?
(i)
liquid-liquid
(ii)
solid-liquid
(iii)
liquid-gas
(iv)
gas-gas
4. The term ‘sorption’
stands for ____________.
(i)
absorption
(ii)
adsorption
(iii)
both absorption and adsorption
(iv)
desorption
5. Extent of physisorption
of a gas increases with ___________.
(i)
increase in temperature.
(ii)
decrease in temperature.
(iii)
decrease in surface area of adsorbent.
(iv)
decrease in strength of van der Waals forces.
6. Extent of adsorption of
adsorbate from solution phase increases with ________.
(i)
increase in amount of adsorbate in solution.
(ii)
decrease in surface area of adsorbent.
(iii)
increase in temperature of solution.
(iv)
decrease in amount of adsorbate in solution.
7. Which one of the
following is not applicable to the phenomenon of adsorption?
(i)
ΔH > 0
(ii)
ΔG < 0
(iii)
ΔS < 0
(iv)
ΔH < 0
8. Which of the following
is not a favourable condition for physical adsorption?
(i)
high pressure
(ii)
negative ΔH
(iii)
higher critical temperature of adsorbate
(iv)
high temperature
9. Physical adsorption of a
gaseous species may change to chemical adsorption
with
______________.
(i)
decrease in temperature
(ii)
increase in temperature
(iii)
increase in surface area of adsorbent
(iv)
decrease in surface area of adsorbent
10. In physisorption
adsorbent does not show specificity for any particular gas
because
______________.
(i)
involved van der Waals forces are universal.
(ii)
gases involved behave like ideal gases.
(iii)
enthalpy of adsorption is low.
(iv)
it is a reversible process.
11. Which of the following
is an example of absorption?
(i)
Water on silica gel
(ii)
Water on calcium chloride
(iii)
Hydrogen on finely divided nickel
(iv)
Oxygen on metal surface
14. At high concentration of
soap in water, soap behaves as ____________.
(i)
molecular colloid
(ii)
associated colloid
(iii)
macromolecular colloid
(iv)
lyophilic colloid
15. Which of the following
will show Tyndall effect?
(i)
Aqueous solution of soap below critical micelle concentration.
(ii)
Aqueous solution of soap above critical micelle concentration.
(iii)
Aqueous solution of sodium chloride.
(iv)
Aqueous solution of sugar.
16. Method by which
lyophobic sol can be protected.
(i)
By addition of oppositely charged sol.
(ii)
By addition of an electrolyte.
(iii)
By addition of lyophilic sol.
(iv)
By boiling.
17. Freshly prepared
precipitate sometimes gets converted to colloidal solution by
___________.
(i)
coagulation
(ii)
electrolysis
(iii)
diffusion
(iv)
peptisation
18. A colloidal system
having a solid substance as a dispersed phase and a liquid
as
a dispersion medium is classified as ____________.
(i)
solid sol
(ii)
gel
(iii)
emulsion
(iv)
sol
20. The values of
colligative properties of colloidal solution are of small order in
comparison
to those shown by true solutions of same concentration because
of
colloidal particles __________________.
(i)
exhibit enormous surface area.
(ii)
remain suspended in the dispersion medium.
(iii)
form lyophilic colloids.
(iv)
are comparatively less in number.
21. Which of the following
process is responsible for the formation of delta at a
place
where rivers meet the sea?
(i)
Emulsification
(ii)
Colloid formation
(iii)
Coagulation
(iv)
Peptisation
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