Surface Chemistry
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Time: 30 Minute
- 1.Catalyst is required in very small non stoichiometric quantities because:
- A.
They are consumed during the reaction
- B.
They are not consumed during the reaction
- C.
They increase the temperature of the reaction
- D.
They slow down the reaction process
- 2.
- A.
Increase in temperature
- B.
Increase in pressure
- C.
Decrease in temperature
- D.
Decrease in pressure
- 3.Alum helps in purifying water by:
- A.
Coagulating the mud particles
- B.
Making mud water soluble
- C.
Forming Si complex with clay particles
- D.
Sulphate part which combines with dirt and removes it
- 4.The basic principle of Cottrell's precipitator is:
- A.
Le Chatelier’s Principle
- B.
Peptisation
- C.
Neutralisation of charge on colloidal particles
- D.
Scattering of light
- 5.In Freundlich Adsorption isotherm predicts a limiting adsorption at:
- A.
Low pressure
- B.
Intermediate pressure
- C.
High pressure
- D.
None of these
- 6.Chromatography is based on the principle of:
- A.
Chemical adsorption
- B.
Physical adsorption
- C.
Hydrogen bonding
- D.
Sedimentation
- 7.Identify the gas which is readily adsorbed by activated charcoal:
- A.
N2
- B.
O2
- C.
H2
- D.
SO2
- 8.Which of the following is correct for lyophilic sols:
- A.
They are irreversible
- B.
They are self stabilised
- C.
They are readily coagulated by addition of electrolytes
- D.
They are formed by inorganic substances
- 9.During the adsorption of Krypton on activated charcoal at low temperature:
- A.
ΔH < 0 and ΔS < 0
- B.
ΔH > 0 and ΔS < 0
- C.
ΔH > 0 and ΔS > 0
- D.
ΔH < 0 and ΔS > 0
- 10.Emulsifying agent is a substance which:
- A.
Makes the emulsion homogeneous
- B.
Helps in coagulating the emulsion
- C.
Accelerates the dispersion
- D.
Stabilises the emulsion
- 11.
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- A.
Irreversible reaction
- B.
Heterogeneous catalysis
- C.
Homogeneous catalysis
- D.
Neutralisation reaction
- 12.The addition of I mL solution of 10% NaCl to 10m gold sol in the presence of 0.25 G. The gold number of starch is:
- A.
0.25
- B.
2.5
- C.
25.0
- D.
250
- 13.The most effective coagulating agent for Sb2S3 sol is:
- A.
Na2SO4
- B.
CaCl2
- C.
Al2 (SO4)3
- D.
NH4Cl
- 14.Faster coagulation of ions with high valency is explained by:
- A.
Tyndall Effect
- B.
Hardy-Schulze Law
- C.
Freundlich law
- D.
Bredig’s Arc Method
- 15.The best coagulant for the precipitation of ferric hydroxide sol is:
- A.
Na3PO4
- B.
NaNO3
- C.
MgSO4
- D.
KCl
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