Solved Example: Surface Chemistry | Chemistry for JEE Main & Advanced PDF Download

 Page 1


JEE Solved Example on Surface Chemistry 
JEE Mains 
Q1:  Which gas will be adsorbed on a solid to greater extent? 
(A) A gas having non polar molecule 
(B) A gas having highest critical temperature 
(C) A gas having lowest critical temperature 
(D) A gas having highest critical pressure 
Ans: (B) A gas with high critical temperature ( T
C
 ) can be liquefied easily. So, it's adsorbed on a solid 
to a greater extent. 
Q2:  Which of the following factors affects the adsorption of a gas on solid? 
(A) ?? ?? (critical temp.) 
(B) Temperature of gas 
(C) Pressure of gas 
(D) All of them 
Ans: (D) Adsorption of a gas depends on 
• ?? ?? of gas 
• Temperature 
• Pressure 
 
Q3:  Which type of metals form effective catalysts? 
(A) Alkali metals 
(B) Transition metals 
(C) Alkaline earth metals 
(D) Radioactive metals 
Ans:  (B) Transition metals form effective catalyst due to high inter -atomic spaces. 
 
Q4: The volume of gases ????
?? , ????
?? and ????
?? adsorbed by one gram of charcoal at ?????? ?? are in 
(A) ????
?? > ????
?? > ????
?? 
(B) ????
?? > ????
?? > ????
?? 
(C) ????
?? > ????
?? > ????
?? 
(D) ????
?? > ????
?? > ????
?? 
Ans: (C) NH
3
> CO
2
> CH
4
 (ease of liquefaction) 
It's because of their ?? ?? 
T
CH
3
> T
C
CO
2
> T
C
CH
4
 
 
Page 2


JEE Solved Example on Surface Chemistry 
JEE Mains 
Q1:  Which gas will be adsorbed on a solid to greater extent? 
(A) A gas having non polar molecule 
(B) A gas having highest critical temperature 
(C) A gas having lowest critical temperature 
(D) A gas having highest critical pressure 
Ans: (B) A gas with high critical temperature ( T
C
 ) can be liquefied easily. So, it's adsorbed on a solid 
to a greater extent. 
Q2:  Which of the following factors affects the adsorption of a gas on solid? 
(A) ?? ?? (critical temp.) 
(B) Temperature of gas 
(C) Pressure of gas 
(D) All of them 
Ans: (D) Adsorption of a gas depends on 
• ?? ?? of gas 
• Temperature 
• Pressure 
 
Q3:  Which type of metals form effective catalysts? 
(A) Alkali metals 
(B) Transition metals 
(C) Alkaline earth metals 
(D) Radioactive metals 
Ans:  (B) Transition metals form effective catalyst due to high inter -atomic spaces. 
 
Q4: The volume of gases ????
?? , ????
?? and ????
?? adsorbed by one gram of charcoal at ?????? ?? are in 
(A) ????
?? > ????
?? > ????
?? 
(B) ????
?? > ????
?? > ????
?? 
(C) ????
?? > ????
?? > ????
?? 
(D) ????
?? > ????
?? > ????
?? 
Ans: (C) NH
3
> CO
2
> CH
4
 (ease of liquefaction) 
It's because of their ?? ?? 
T
CH
3
> T
C
CO
2
> T
C
CH
4
 
 
Q5:  The heat of physisorption lie in the range of 
(A) ?? - ???? ???? ?????? -?? 
(B) 20 to ???? ???? ?????? -?? 
(C) 40 to ?????? ???? ?????? -?? 
(D) 200 to ?????? ???? ?????? -?? 
Ans:  The heat of physisorption is quite low. It's in the range of 20 - 40 kJ/mole. 
Q6: Adsorption is multilayer in case of 
(A) Physical adsorption 
(B) Chemisorptions 
(C) In both 
(D) None of these 
Ans: (A) Physical adsorption can be multi -layered because of Van der Waals forces. 
Q7:  Reversible adsorption is 
(A) Chemical adsorption 
(B) Physical adsorption 
(C) Both (A) and (B) 
(D) None of these 
Ans: (B) Physical adsorption is reversible but not chemical. It's because chemisorption has high 
activation energy. 
Q8:  Which of the following is not a gel? 
(A) Cheese 
(B) Jellies 
(C) Curd 
(D) Milk 
Ans: (D) Gels - Solid in liquid (jelly type). Milk is an emulsion, rest all are gels. 
 
Q9:  The amount of gas adsorbed physically on charcoal increases with increase of 
(A) Temperature and pressure 
(B) Temperature and decreases of pressure 
(C) Pressure and decreases of temperature 
(D) None of these 
Ans: (C) Increases with P , decreases with T. 
 
 
 
 
Page 3


JEE Solved Example on Surface Chemistry 
JEE Mains 
Q1:  Which gas will be adsorbed on a solid to greater extent? 
(A) A gas having non polar molecule 
(B) A gas having highest critical temperature 
(C) A gas having lowest critical temperature 
(D) A gas having highest critical pressure 
Ans: (B) A gas with high critical temperature ( T
C
 ) can be liquefied easily. So, it's adsorbed on a solid 
to a greater extent. 
Q2:  Which of the following factors affects the adsorption of a gas on solid? 
(A) ?? ?? (critical temp.) 
(B) Temperature of gas 
(C) Pressure of gas 
(D) All of them 
Ans: (D) Adsorption of a gas depends on 
• ?? ?? of gas 
• Temperature 
• Pressure 
 
Q3:  Which type of metals form effective catalysts? 
(A) Alkali metals 
(B) Transition metals 
(C) Alkaline earth metals 
(D) Radioactive metals 
Ans:  (B) Transition metals form effective catalyst due to high inter -atomic spaces. 
 
Q4: The volume of gases ????
?? , ????
?? and ????
?? adsorbed by one gram of charcoal at ?????? ?? are in 
(A) ????
?? > ????
?? > ????
?? 
(B) ????
?? > ????
?? > ????
?? 
(C) ????
?? > ????
?? > ????
?? 
(D) ????
?? > ????
?? > ????
?? 
Ans: (C) NH
3
> CO
2
> CH
4
 (ease of liquefaction) 
It's because of their ?? ?? 
T
CH
3
> T
C
CO
2
> T
C
CH
4
 
 
Q5:  The heat of physisorption lie in the range of 
(A) ?? - ???? ???? ?????? -?? 
(B) 20 to ???? ???? ?????? -?? 
(C) 40 to ?????? ???? ?????? -?? 
(D) 200 to ?????? ???? ?????? -?? 
Ans:  The heat of physisorption is quite low. It's in the range of 20 - 40 kJ/mole. 
Q6: Adsorption is multilayer in case of 
(A) Physical adsorption 
(B) Chemisorptions 
(C) In both 
(D) None of these 
Ans: (A) Physical adsorption can be multi -layered because of Van der Waals forces. 
Q7:  Reversible adsorption is 
(A) Chemical adsorption 
(B) Physical adsorption 
(C) Both (A) and (B) 
(D) None of these 
Ans: (B) Physical adsorption is reversible but not chemical. It's because chemisorption has high 
activation energy. 
Q8:  Which of the following is not a gel? 
(A) Cheese 
(B) Jellies 
(C) Curd 
(D) Milk 
Ans: (D) Gels - Solid in liquid (jelly type). Milk is an emulsion, rest all are gels. 
 
Q9:  The amount of gas adsorbed physically on charcoal increases with increase of 
(A) Temperature and pressure 
(B) Temperature and decreases of pressure 
(C) Pressure and decreases of temperature 
(D) None of these 
Ans: (C) Increases with P , decreases with T. 
 
 
 
 
Q10:  An emulsion is a colloidal system of 
(A) Two solids 
(B) Two liquids 
(C) One gas and one solid 
(D) One gas and one liquid 
Ans: (B) Emulsion is a colloidal system of 2 liquids. 
 
 
Q11:  Which of the following is a lyophobic colloid? 
(A) Gelatin 
(B) Sulphur 
(C) Starch 
(D) Gum 
Ans: (B) Sulphur does not dissolve in water. It's a lyophobic colloid. 
 
 
Q12:  The nature of bonding forces in adsorption 
(A) Purely physical such as Van Dar Waal's forces 
(B) Purely chemical 
(C) Both chemical and physical always 
(D) None of these 
Ans: (B) Physical - Van der Waals. Chemical Chemical bonds. 
 
Q13:  Which can adsorb larger volume of hydrogen gas? 
(A) Colloidal solution of palladium 
(B) Finely divided nickel 
(C) Finely divided platinum 
(D) Colloidal ???? (???? )
?? 
Ans:  (A) Colloidal solution of Pd because Pd has highly affinity towards H and colloid solution will 
have higher Pd surface. 
 
Q14:  Which statement is correct? 
(A) A catalyst increases the rate of a reaction by decreasing the rate of backward reaction 
(B) The reaction is fast if the activation energy of a reaction is low 
(C) The activation energy of a forward reaction can never be sma ller than that of the back ward 
reaction 
(D) Reaction rate increases with temperature because the activation energy decreases at high 
temperature 
Page 4


JEE Solved Example on Surface Chemistry 
JEE Mains 
Q1:  Which gas will be adsorbed on a solid to greater extent? 
(A) A gas having non polar molecule 
(B) A gas having highest critical temperature 
(C) A gas having lowest critical temperature 
(D) A gas having highest critical pressure 
Ans: (B) A gas with high critical temperature ( T
C
 ) can be liquefied easily. So, it's adsorbed on a solid 
to a greater extent. 
Q2:  Which of the following factors affects the adsorption of a gas on solid? 
(A) ?? ?? (critical temp.) 
(B) Temperature of gas 
(C) Pressure of gas 
(D) All of them 
Ans: (D) Adsorption of a gas depends on 
• ?? ?? of gas 
• Temperature 
• Pressure 
 
Q3:  Which type of metals form effective catalysts? 
(A) Alkali metals 
(B) Transition metals 
(C) Alkaline earth metals 
(D) Radioactive metals 
Ans:  (B) Transition metals form effective catalyst due to high inter -atomic spaces. 
 
Q4: The volume of gases ????
?? , ????
?? and ????
?? adsorbed by one gram of charcoal at ?????? ?? are in 
(A) ????
?? > ????
?? > ????
?? 
(B) ????
?? > ????
?? > ????
?? 
(C) ????
?? > ????
?? > ????
?? 
(D) ????
?? > ????
?? > ????
?? 
Ans: (C) NH
3
> CO
2
> CH
4
 (ease of liquefaction) 
It's because of their ?? ?? 
T
CH
3
> T
C
CO
2
> T
C
CH
4
 
 
Q5:  The heat of physisorption lie in the range of 
(A) ?? - ???? ???? ?????? -?? 
(B) 20 to ???? ???? ?????? -?? 
(C) 40 to ?????? ???? ?????? -?? 
(D) 200 to ?????? ???? ?????? -?? 
Ans:  The heat of physisorption is quite low. It's in the range of 20 - 40 kJ/mole. 
Q6: Adsorption is multilayer in case of 
(A) Physical adsorption 
(B) Chemisorptions 
(C) In both 
(D) None of these 
Ans: (A) Physical adsorption can be multi -layered because of Van der Waals forces. 
Q7:  Reversible adsorption is 
(A) Chemical adsorption 
(B) Physical adsorption 
(C) Both (A) and (B) 
(D) None of these 
Ans: (B) Physical adsorption is reversible but not chemical. It's because chemisorption has high 
activation energy. 
Q8:  Which of the following is not a gel? 
(A) Cheese 
(B) Jellies 
(C) Curd 
(D) Milk 
Ans: (D) Gels - Solid in liquid (jelly type). Milk is an emulsion, rest all are gels. 
 
Q9:  The amount of gas adsorbed physically on charcoal increases with increase of 
(A) Temperature and pressure 
(B) Temperature and decreases of pressure 
(C) Pressure and decreases of temperature 
(D) None of these 
Ans: (C) Increases with P , decreases with T. 
 
 
 
 
Q10:  An emulsion is a colloidal system of 
(A) Two solids 
(B) Two liquids 
(C) One gas and one solid 
(D) One gas and one liquid 
Ans: (B) Emulsion is a colloidal system of 2 liquids. 
 
 
Q11:  Which of the following is a lyophobic colloid? 
(A) Gelatin 
(B) Sulphur 
(C) Starch 
(D) Gum 
Ans: (B) Sulphur does not dissolve in water. It's a lyophobic colloid. 
 
 
Q12:  The nature of bonding forces in adsorption 
(A) Purely physical such as Van Dar Waal's forces 
(B) Purely chemical 
(C) Both chemical and physical always 
(D) None of these 
Ans: (B) Physical - Van der Waals. Chemical Chemical bonds. 
 
Q13:  Which can adsorb larger volume of hydrogen gas? 
(A) Colloidal solution of palladium 
(B) Finely divided nickel 
(C) Finely divided platinum 
(D) Colloidal ???? (???? )
?? 
Ans:  (A) Colloidal solution of Pd because Pd has highly affinity towards H and colloid solution will 
have higher Pd surface. 
 
Q14:  Which statement is correct? 
(A) A catalyst increases the rate of a reaction by decreasing the rate of backward reaction 
(B) The reaction is fast if the activation energy of a reaction is low 
(C) The activation energy of a forward reaction can never be sma ller than that of the back ward 
reaction 
(D) Reaction rate increases with temperature because the activation energy decreases at high 
temperature 
Ans: (B) The reaction is fast, if activation energy is low. Catalyst reduces activation energy. 
Activation energy need not be inversely proportion to temperature. 
 
 
Q15:  The Tyndall effect associated with colloidal particles is due to 
(A) Presence of electrical charges 
(B) Scattering of light 
(C) Absorption of light 
(D) Reflection of light 
Ans: (B) Scattering of light. 
 
Q16:  Which one of the following is not applicable to chemisorptions? 
(A) Its heat of adsorption is high 
(B) It takes place at high temperature 
(C) It is reversible 
(D) It forms mono-molecular layers 
Ans:  (C) Chemisorption is not reversible. Other statements are true about chemisorption. 
 
Q17:  In the colloidal state the particle size ranges 
(A) Below ?? ???? 
(B) Between ?? ?? to ?????? ???? 
(C) More than ?????? ???? 
(D) None of the above 
Ans: (B) In colloids, size of particles is nearly wavelength of visible light. i.e. 1 nm - 100 nm range. 
 
Q18:  All colloids 
(A) Are suspensions of one phase in another 
(B) Are two-phase systems 
(C) Contain only water-soluble particles 
(D) Are true solutions 
Ans: (B) Colloids are 2 phase system. They are different from suspensions. 
 
 
 
 
 
 
Page 5


JEE Solved Example on Surface Chemistry 
JEE Mains 
Q1:  Which gas will be adsorbed on a solid to greater extent? 
(A) A gas having non polar molecule 
(B) A gas having highest critical temperature 
(C) A gas having lowest critical temperature 
(D) A gas having highest critical pressure 
Ans: (B) A gas with high critical temperature ( T
C
 ) can be liquefied easily. So, it's adsorbed on a solid 
to a greater extent. 
Q2:  Which of the following factors affects the adsorption of a gas on solid? 
(A) ?? ?? (critical temp.) 
(B) Temperature of gas 
(C) Pressure of gas 
(D) All of them 
Ans: (D) Adsorption of a gas depends on 
• ?? ?? of gas 
• Temperature 
• Pressure 
 
Q3:  Which type of metals form effective catalysts? 
(A) Alkali metals 
(B) Transition metals 
(C) Alkaline earth metals 
(D) Radioactive metals 
Ans:  (B) Transition metals form effective catalyst due to high inter -atomic spaces. 
 
Q4: The volume of gases ????
?? , ????
?? and ????
?? adsorbed by one gram of charcoal at ?????? ?? are in 
(A) ????
?? > ????
?? > ????
?? 
(B) ????
?? > ????
?? > ????
?? 
(C) ????
?? > ????
?? > ????
?? 
(D) ????
?? > ????
?? > ????
?? 
Ans: (C) NH
3
> CO
2
> CH
4
 (ease of liquefaction) 
It's because of their ?? ?? 
T
CH
3
> T
C
CO
2
> T
C
CH
4
 
 
Q5:  The heat of physisorption lie in the range of 
(A) ?? - ???? ???? ?????? -?? 
(B) 20 to ???? ???? ?????? -?? 
(C) 40 to ?????? ???? ?????? -?? 
(D) 200 to ?????? ???? ?????? -?? 
Ans:  The heat of physisorption is quite low. It's in the range of 20 - 40 kJ/mole. 
Q6: Adsorption is multilayer in case of 
(A) Physical adsorption 
(B) Chemisorptions 
(C) In both 
(D) None of these 
Ans: (A) Physical adsorption can be multi -layered because of Van der Waals forces. 
Q7:  Reversible adsorption is 
(A) Chemical adsorption 
(B) Physical adsorption 
(C) Both (A) and (B) 
(D) None of these 
Ans: (B) Physical adsorption is reversible but not chemical. It's because chemisorption has high 
activation energy. 
Q8:  Which of the following is not a gel? 
(A) Cheese 
(B) Jellies 
(C) Curd 
(D) Milk 
Ans: (D) Gels - Solid in liquid (jelly type). Milk is an emulsion, rest all are gels. 
 
Q9:  The amount of gas adsorbed physically on charcoal increases with increase of 
(A) Temperature and pressure 
(B) Temperature and decreases of pressure 
(C) Pressure and decreases of temperature 
(D) None of these 
Ans: (C) Increases with P , decreases with T. 
 
 
 
 
Q10:  An emulsion is a colloidal system of 
(A) Two solids 
(B) Two liquids 
(C) One gas and one solid 
(D) One gas and one liquid 
Ans: (B) Emulsion is a colloidal system of 2 liquids. 
 
 
Q11:  Which of the following is a lyophobic colloid? 
(A) Gelatin 
(B) Sulphur 
(C) Starch 
(D) Gum 
Ans: (B) Sulphur does not dissolve in water. It's a lyophobic colloid. 
 
 
Q12:  The nature of bonding forces in adsorption 
(A) Purely physical such as Van Dar Waal's forces 
(B) Purely chemical 
(C) Both chemical and physical always 
(D) None of these 
Ans: (B) Physical - Van der Waals. Chemical Chemical bonds. 
 
Q13:  Which can adsorb larger volume of hydrogen gas? 
(A) Colloidal solution of palladium 
(B) Finely divided nickel 
(C) Finely divided platinum 
(D) Colloidal ???? (???? )
?? 
Ans:  (A) Colloidal solution of Pd because Pd has highly affinity towards H and colloid solution will 
have higher Pd surface. 
 
Q14:  Which statement is correct? 
(A) A catalyst increases the rate of a reaction by decreasing the rate of backward reaction 
(B) The reaction is fast if the activation energy of a reaction is low 
(C) The activation energy of a forward reaction can never be sma ller than that of the back ward 
reaction 
(D) Reaction rate increases with temperature because the activation energy decreases at high 
temperature 
Ans: (B) The reaction is fast, if activation energy is low. Catalyst reduces activation energy. 
Activation energy need not be inversely proportion to temperature. 
 
 
Q15:  The Tyndall effect associated with colloidal particles is due to 
(A) Presence of electrical charges 
(B) Scattering of light 
(C) Absorption of light 
(D) Reflection of light 
Ans: (B) Scattering of light. 
 
Q16:  Which one of the following is not applicable to chemisorptions? 
(A) Its heat of adsorption is high 
(B) It takes place at high temperature 
(C) It is reversible 
(D) It forms mono-molecular layers 
Ans:  (C) Chemisorption is not reversible. Other statements are true about chemisorption. 
 
Q17:  In the colloidal state the particle size ranges 
(A) Below ?? ???? 
(B) Between ?? ?? to ?????? ???? 
(C) More than ?????? ???? 
(D) None of the above 
Ans: (B) In colloids, size of particles is nearly wavelength of visible light. i.e. 1 nm - 100 nm range. 
 
Q18:  All colloids 
(A) Are suspensions of one phase in another 
(B) Are two-phase systems 
(C) Contain only water-soluble particles 
(D) Are true solutions 
Ans: (B) Colloids are 2 phase system. They are different from suspensions. 
 
 
 
 
 
 
Q19:  Which is an example of auto-catalysis? 
(A) Decomposition of ???????? ?? + ?????? ?? mixture 
(B) The decomposition of nitroglycerine 
(C) Breakdown of  
?? ?? ????
 
(D) Hydrogenation of vegetable oils using catalyst 
Ans: (B) Decomposition of nitro glycerine is autocatalysis. So it's used in explosive, TNT. 
 
Q20: Colloids can be purified by 
(A) Condensation 
(B) Peptization 
(C) Coagulation 
(D) Dialysis 
Ans: (D) Colloids can be purified by dialysis. 
 
Q21:  Milk is an example of 
(A) Emulsion 
(B) Suspension 
(C) Foam 
(D) Sol 
Ans: (A) Milk-Emulsion. (Oil in water) 
 
 
JEE Advanced 
Single Correct Type 
Q22:  Which equation represents Freundlich adsorption isotherm (physical adsorption is basis of 
this theory)? 
(A) 
?? ?? = ?? (?? )
?? /?? Where ?? is amount of gas adsorbed on mass ' ?? ' at pressure ?? 
(B) ?????? 
?? ?? = ?????? ?? +
?? ?? ?????? ?? 
(C) 
?? ?? = ???? at low pressure and 
?? ?? = ?? at high pressure 
(D) All of these 
Ans: (D) 
?? ?? = ?? (?? )
1
?? ? log (
?? ?? ) =
1
?? log ?? + log ?? . 
At high ?? 
x
m
˜ K