Surface Chemistry Practice Questions - DPP for JEE

 Page 1


1. Which of the following electrolytes is least effective in coagulating
ferric hydroxide solution?
(a) KBr
(b) K
2
SO
4
(c) K
2
CrO
4
(d) K
4
 [Fe(CN)
6
]
2. One desires to prepare a positively charged sol of silver iodide. This can
be achieved by
(a) adding small amount of AgNO
3
 solution to KI solution in slight excess
(b) adding small amount of KI solution to AgNO
3
 solution in slight excess
(c) mixing equal volumes of equimolar solutions of AgNO
3
 and KI
(d) None of these
3. Freundlich equation for adsorption of gases (in amount of x g) on a solid
(in amount of m g) at constant temperature can be expressed as
(a)
Page 2


1. Which of the following electrolytes is least effective in coagulating
ferric hydroxide solution?
(a) KBr
(b) K
2
SO
4
(c) K
2
CrO
4
(d) K
4
 [Fe(CN)
6
]
2. One desires to prepare a positively charged sol of silver iodide. This can
be achieved by
(a) adding small amount of AgNO
3
 solution to KI solution in slight excess
(b) adding small amount of KI solution to AgNO
3
 solution in slight excess
(c) mixing equal volumes of equimolar solutions of AgNO
3
 and KI
(d) None of these
3. Freundlich equation for adsorption of gases (in amount of x g) on a solid
(in amount of m g) at constant temperature can be expressed as
(a)
(b)
(c)
(d)
4. The size of colloidal particles is of the order
(a) > 0.1 µ
(b) 1mµ to 0.2µ
(c) < 1 mµ
(d) > 10 mµ
5. Which of the following constitutes irreversible colloidal system in water
as dispersion medium?
(a) Clay
(b) Platinum
(c) Fe(OH)
3
(d) All of these
6. Which of the following forms cationic micelles above certain
concentration?
(a) Sodium dodecyl sulphate
(b) Sodium acetate
(c) Urea
(d) Cetyl trimethyl ammonium bromide
7. Position of non-polar and polar part in micelle is
(a) polar at outer surface and non-polar at inner surface
(b) polar at inner surface and non-polar at outer surface
Page 3


1. Which of the following electrolytes is least effective in coagulating
ferric hydroxide solution?
(a) KBr
(b) K
2
SO
4
(c) K
2
CrO
4
(d) K
4
 [Fe(CN)
6
]
2. One desires to prepare a positively charged sol of silver iodide. This can
be achieved by
(a) adding small amount of AgNO
3
 solution to KI solution in slight excess
(b) adding small amount of KI solution to AgNO
3
 solution in slight excess
(c) mixing equal volumes of equimolar solutions of AgNO
3
 and KI
(d) None of these
3. Freundlich equation for adsorption of gases (in amount of x g) on a solid
(in amount of m g) at constant temperature can be expressed as
(a)
(b)
(c)
(d)
4. The size of colloidal particles is of the order
(a) > 0.1 µ
(b) 1mµ to 0.2µ
(c) < 1 mµ
(d) > 10 mµ
5. Which of the following constitutes irreversible colloidal system in water
as dispersion medium?
(a) Clay
(b) Platinum
(c) Fe(OH)
3
(d) All of these
6. Which of the following forms cationic micelles above certain
concentration?
(a) Sodium dodecyl sulphate
(b) Sodium acetate
(c) Urea
(d) Cetyl trimethyl ammonium bromide
7. Position of non-polar and polar part in micelle is
(a) polar at outer surface and non-polar at inner surface
(b) polar at inner surface and non-polar at outer surface
(c) distributed all over the surface
(d) present in the surface only
8. The cause of Brownian movement is
(a) Heat changes in liquid state.
(b) Convectional currents.
(c) The impact of molecules of the dispersion medium on the colloidal
particles.
(d) Attractive forces between the colloidal particles and molecules of
dispersion medium.
9. Which of the following curves is in accordance with Freundlich
adsorption isotherm ?
(a)
(b)
(c)
Page 4


1. Which of the following electrolytes is least effective in coagulating
ferric hydroxide solution?
(a) KBr
(b) K
2
SO
4
(c) K
2
CrO
4
(d) K
4
 [Fe(CN)
6
]
2. One desires to prepare a positively charged sol of silver iodide. This can
be achieved by
(a) adding small amount of AgNO
3
 solution to KI solution in slight excess
(b) adding small amount of KI solution to AgNO
3
 solution in slight excess
(c) mixing equal volumes of equimolar solutions of AgNO
3
 and KI
(d) None of these
3. Freundlich equation for adsorption of gases (in amount of x g) on a solid
(in amount of m g) at constant temperature can be expressed as
(a)
(b)
(c)
(d)
4. The size of colloidal particles is of the order
(a) > 0.1 µ
(b) 1mµ to 0.2µ
(c) < 1 mµ
(d) > 10 mµ
5. Which of the following constitutes irreversible colloidal system in water
as dispersion medium?
(a) Clay
(b) Platinum
(c) Fe(OH)
3
(d) All of these
6. Which of the following forms cationic micelles above certain
concentration?
(a) Sodium dodecyl sulphate
(b) Sodium acetate
(c) Urea
(d) Cetyl trimethyl ammonium bromide
7. Position of non-polar and polar part in micelle is
(a) polar at outer surface and non-polar at inner surface
(b) polar at inner surface and non-polar at outer surface
(c) distributed all over the surface
(d) present in the surface only
8. The cause of Brownian movement is
(a) Heat changes in liquid state.
(b) Convectional currents.
(c) The impact of molecules of the dispersion medium on the colloidal
particles.
(d) Attractive forces between the colloidal particles and molecules of
dispersion medium.
9. Which of the following curves is in accordance with Freundlich
adsorption isotherm ?
(a)
(b)
(c)
(d)
10. A colloidal solution is subjected to an electrical field. The particles
move towards anode. The coagulation of same sol is studied using NaCl,
BaCl
2
 and AlCl
3
 solutions. Their coagulating power should be
(a) NaCl > BaCl
2
 > AlCl
3
(b) BaCl
2
 > AlCl
3
 > NaCl 
(c) AlCl
3
 > BaCl
3
 > NaCl
(d) BaCl
2
 > NaCl > AlCl
3
11. Which of the following is most effective in causing the coagulation of
ferric hydroxide sol?
(a) KCl
(b) KNO
3
(c) K
2
SO
4
(d) K
3
[Fe(CN)
6
]
12. Which of the following statements is incorrect?
(a) Colloidal gold is used for intramuscular injection.
(b) Colloidal solution of latex is used in preparation of rubber.
(c) Photographic films are prepared by coating an emulsion of AgBr in
gelatin over glass plate.
(d) Tannin used in leather industry contains positively charged colloidal
particles.
13. Alum helps in purifying water by
(a) forming Si complex with clay particles.
(b) sulphate part which combines with the dirt and removes it.
Page 5


1. Which of the following electrolytes is least effective in coagulating
ferric hydroxide solution?
(a) KBr
(b) K
2
SO
4
(c) K
2
CrO
4
(d) K
4
 [Fe(CN)
6
]
2. One desires to prepare a positively charged sol of silver iodide. This can
be achieved by
(a) adding small amount of AgNO
3
 solution to KI solution in slight excess
(b) adding small amount of KI solution to AgNO
3
 solution in slight excess
(c) mixing equal volumes of equimolar solutions of AgNO
3
 and KI
(d) None of these
3. Freundlich equation for adsorption of gases (in amount of x g) on a solid
(in amount of m g) at constant temperature can be expressed as
(a)
(b)
(c)
(d)
4. The size of colloidal particles is of the order
(a) > 0.1 µ
(b) 1mµ to 0.2µ
(c) < 1 mµ
(d) > 10 mµ
5. Which of the following constitutes irreversible colloidal system in water
as dispersion medium?
(a) Clay
(b) Platinum
(c) Fe(OH)
3
(d) All of these
6. Which of the following forms cationic micelles above certain
concentration?
(a) Sodium dodecyl sulphate
(b) Sodium acetate
(c) Urea
(d) Cetyl trimethyl ammonium bromide
7. Position of non-polar and polar part in micelle is
(a) polar at outer surface and non-polar at inner surface
(b) polar at inner surface and non-polar at outer surface
(c) distributed all over the surface
(d) present in the surface only
8. The cause of Brownian movement is
(a) Heat changes in liquid state.
(b) Convectional currents.
(c) The impact of molecules of the dispersion medium on the colloidal
particles.
(d) Attractive forces between the colloidal particles and molecules of
dispersion medium.
9. Which of the following curves is in accordance with Freundlich
adsorption isotherm ?
(a)
(b)
(c)
(d)
10. A colloidal solution is subjected to an electrical field. The particles
move towards anode. The coagulation of same sol is studied using NaCl,
BaCl
2
 and AlCl
3
 solutions. Their coagulating power should be
(a) NaCl > BaCl
2
 > AlCl
3
(b) BaCl
2
 > AlCl
3
 > NaCl 
(c) AlCl
3
 > BaCl
3
 > NaCl
(d) BaCl
2
 > NaCl > AlCl
3
11. Which of the following is most effective in causing the coagulation of
ferric hydroxide sol?
(a) KCl
(b) KNO
3
(c) K
2
SO
4
(d) K
3
[Fe(CN)
6
]
12. Which of the following statements is incorrect?
(a) Colloidal gold is used for intramuscular injection.
(b) Colloidal solution of latex is used in preparation of rubber.
(c) Photographic films are prepared by coating an emulsion of AgBr in
gelatin over glass plate.
(d) Tannin used in leather industry contains positively charged colloidal
particles.
13. Alum helps in purifying water by
(a) forming Si complex with clay particles.
(b) sulphate part which combines with the dirt and removes it.
(c) aluminium which coagulates the mud particles.
(d) making mud water soluble.
14. Which is not correct regarding the adsorption of a gas on surface of
solid?
(a) On increasing temperature, adsorption increases continuously.
(b) Enthalpy and entropy changes are –ve.
(c) Adsorption is more for some specific substances.
(d) This phenomenon is reversible.
15. Example of intrinsic colloid is
(a) glue
(b) sulphur
(c) Fe
(d) As
2
S
3
16. For adsorption of a gas on a solid, the plot of log x/m vs log P is linear
with slope equal to (n being whole number)
(a) k
(b) log k
(c) n
(d)
17. Which of the following will show Tyndall effect?
(a) Aqueous solution of soap below critical micelle concentration.
(b) Aqueous solution of soap above critical micelle concentration.
(c) Aqueous solution of sodium chloride.
(d) Aqueous solution of sugar.
18. 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) Coagulation in both sols can be brought about by electrophoresis