Electrochemistry MCQ | Additional Documents & Tests for IIT JAM PDF Download

 Page 1


 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
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MULTIPLE SELECT QUESTION  ELECTROCHEMISTRY   IIT JAM 
1. If the e.m.f of a galvanic cell is negative, it implies that: 
(a) The cell reaction is spontaneous  (b) The cell reaction is non-spontaneous 
(c) The cell reaction is exothermic (d) The cell reaction is working in reverse direction 
 
2. Select right statement(s) about electrolysis: 
(a) Electric correct is used to drive a non-spontaneous reaction 
(b) ?G is positive for chemical process during electrolysis 
(c) Cations and anions are moved toward the anode and cathode respectively 
(d) Over voltage is generally associated with evolution of O 2 gas 
 
3. If the half-cell reaction A + e
-
 ? A
-
 has a large negative reduction potentials, if follows that: 
(a) A is readily reduced    (b) A is readily oxidized 
(c) A
-
 is readily reduced    (d) A
-
 is readily oxidized 
4. Which of the following statement is correct? 
If  E
0
Cu
2+
| Cu = 0.34 V and E
0
Sn
2+
| Sn = - 0.136 V,  E
0
H
+
| 
2
H
 = 0.0 V 
(a) Cu
2+
 ions can be reduced by H 2 (g)  (b) Cu ions can be oxidized by H
+
 
(c) Sn
2+
 ions can be reduced by H 2   (d) Sn can be oxidized by Cu
2+ 
 
5. The oxidation potential of hydrogen half-cell will be negative if: 
(a) p(H 2) = 1 atm and [H
+
] = 1 M  (b) p(H 2) = 1 atm and [H
+
] = 2 M 
(c) p(H 2) = 0.2 atm and [H
+
] = 1 M  (d) p(H 2) = 0.2 atm and [H
+
] = 0.2 M 
 
6. Which of the following arrangement will produce oxygen at anode during electrolysis? 
(a) Dilute H 2SO 4 with Pt electrodes  (b) Fused NaOH with inert electrodes 
(c) Dilute H 2SO 4 with Cu electrodes  (d) Concentrate aq. NaCl with Pt electrodes 
 
7. When an aqueous concentrate solution of lithium chloride is electrolyzed using inert electrodes: 
(a) Cl 2 is liberated at the anode 
(b) Li is deposited at the cathode 
(c)  As the correct flows, pH of the solution around the cathode remains constant  
(d) As the correct flows, pH of the solution around the cathode increases 
 
8. Oxygen and hydrogen gas are produced at the anode and cathode during the electrolysis of fairly 
concentrate aqueous solution of: 
(a) K 2SO 4  (b) AgNO 3  (c) H 2SO 4  (d) NaOH 
9. During the purification of copper by electrolysis: 
(a) The anode used is mode of copper ore 
(b) Pure copper is deposited on the cathode 
(c) The impurities such as Ag, Au present in solution as ions 
(d) Concentration of CuSO 4 solution remains constant during dissolution Cu 
Page 2


 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
MULTIPLE SELECT QUESTION  ELECTROCHEMISTRY   IIT JAM 
1. If the e.m.f of a galvanic cell is negative, it implies that: 
(a) The cell reaction is spontaneous  (b) The cell reaction is non-spontaneous 
(c) The cell reaction is exothermic (d) The cell reaction is working in reverse direction 
 
2. Select right statement(s) about electrolysis: 
(a) Electric correct is used to drive a non-spontaneous reaction 
(b) ?G is positive for chemical process during electrolysis 
(c) Cations and anions are moved toward the anode and cathode respectively 
(d) Over voltage is generally associated with evolution of O 2 gas 
 
3. If the half-cell reaction A + e
-
 ? A
-
 has a large negative reduction potentials, if follows that: 
(a) A is readily reduced    (b) A is readily oxidized 
(c) A
-
 is readily reduced    (d) A
-
 is readily oxidized 
4. Which of the following statement is correct? 
If  E
0
Cu
2+
| Cu = 0.34 V and E
0
Sn
2+
| Sn = - 0.136 V,  E
0
H
+
| 
2
H
 = 0.0 V 
(a) Cu
2+
 ions can be reduced by H 2 (g)  (b) Cu ions can be oxidized by H
+
 
(c) Sn
2+
 ions can be reduced by H 2   (d) Sn can be oxidized by Cu
2+ 
 
5. The oxidation potential of hydrogen half-cell will be negative if: 
(a) p(H 2) = 1 atm and [H
+
] = 1 M  (b) p(H 2) = 1 atm and [H
+
] = 2 M 
(c) p(H 2) = 0.2 atm and [H
+
] = 1 M  (d) p(H 2) = 0.2 atm and [H
+
] = 0.2 M 
 
6. Which of the following arrangement will produce oxygen at anode during electrolysis? 
(a) Dilute H 2SO 4 with Pt electrodes  (b) Fused NaOH with inert electrodes 
(c) Dilute H 2SO 4 with Cu electrodes  (d) Concentrate aq. NaCl with Pt electrodes 
 
7. When an aqueous concentrate solution of lithium chloride is electrolyzed using inert electrodes: 
(a) Cl 2 is liberated at the anode 
(b) Li is deposited at the cathode 
(c)  As the correct flows, pH of the solution around the cathode remains constant  
(d) As the correct flows, pH of the solution around the cathode increases 
 
8. Oxygen and hydrogen gas are produced at the anode and cathode during the electrolysis of fairly 
concentrate aqueous solution of: 
(a) K 2SO 4  (b) AgNO 3  (c) H 2SO 4  (d) NaOH 
9. During the purification of copper by electrolysis: 
(a) The anode used is mode of copper ore 
(b) Pure copper is deposited on the cathode 
(c) The impurities such as Ag, Au present in solution as ions 
(d) Concentration of CuSO 4 solution remains constant during dissolution Cu 
 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
10. When a lead storage battery is discharged: 
(a) SO 2 is evolved    (b) Lead sulphate is produced at both electrodes 
(c) Sulphuric acid is consumed   (d) Water is formed 
 
11. Which of the following is characteristic of the cathode in a voltaic cell? 
(a) It may gain weight during reaction (b) Electrons flow to it through the external circuit 
(c) It is where oxidation occurs  (d) It received electrons from ions in solution 
 
12. In an electrochemical process, a salt bridge is used: 
(a) To maintain electrical neutrality in each solution 
(b) To complete the external circuit so that current can flow for long time. 
(c)  To mix the solution of anodic and cathodic compartment 
(d) To supply voltage 
13. For a reaction in a galvanic cell the value of - ?G
0
 at certain temperature is not necessarily equal 
to:  
(a) nFE
0
  (b) RT ln K  (c) T ?S
0
 - ?H
0
  (d) zero 
14. Standard electrode potential of two half-reactions are given below: 
20
Fe Fe E 0.44 V
?
?? 
3 2 0
Fe Fe E 0.77 V
??
?? 
 If Fe
2+
, Fe
3+
 and Fe are kept together: 
 (a) The concentration Fe
3+
 increases  (b) The concentration Fe
3+
 decreases 
 (c) The mass of Fe increases   (d) The concentration Fe
2+
 decreases   
 
15. Which of the following statements are correct regarding to galvanic cell? 
(a) A reaction is spontaneous from left to right if E cell > 0 
(b) A reaction occurs from right of left if E cell < 0 
(c) If the system is at equilibrium no net reaction occurs 
(d) E cell is temperature-independent 
16. Which of the following are concentration cells? 
(a) Pt | H 2(g)P 1 || HCl | H 2(g)P 2 | Pt           (b) Cd, (Hg)a 1 || Cd
2+
c | (Hg)a 2,Cd 
(c)  Zn(s) |Zn
2+
c 1 || Cu
2+
c 2 | Cu    (d)Ag|AgCl|Cl
-
(aq)c 1||Br
-
(aq)c 2|AgBr|Ag   
17. In electrolyte concentration cell: 
(a) The electrode material and the solution in both half –cells are composed of the same 
substances 
(b) Only the concentrations of solutions of the same substances is different  
(c) E
0
cell = 0 
(d) The Nernst equation reduces to E cell = 
0.0591
n
??
?
??
??
 log Q at 25
0
C 
 
 
Page 3


 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
MULTIPLE SELECT QUESTION  ELECTROCHEMISTRY   IIT JAM 
1. If the e.m.f of a galvanic cell is negative, it implies that: 
(a) The cell reaction is spontaneous  (b) The cell reaction is non-spontaneous 
(c) The cell reaction is exothermic (d) The cell reaction is working in reverse direction 
 
2. Select right statement(s) about electrolysis: 
(a) Electric correct is used to drive a non-spontaneous reaction 
(b) ?G is positive for chemical process during electrolysis 
(c) Cations and anions are moved toward the anode and cathode respectively 
(d) Over voltage is generally associated with evolution of O 2 gas 
 
3. If the half-cell reaction A + e
-
 ? A
-
 has a large negative reduction potentials, if follows that: 
(a) A is readily reduced    (b) A is readily oxidized 
(c) A
-
 is readily reduced    (d) A
-
 is readily oxidized 
4. Which of the following statement is correct? 
If  E
0
Cu
2+
| Cu = 0.34 V and E
0
Sn
2+
| Sn = - 0.136 V,  E
0
H
+
| 
2
H
 = 0.0 V 
(a) Cu
2+
 ions can be reduced by H 2 (g)  (b) Cu ions can be oxidized by H
+
 
(c) Sn
2+
 ions can be reduced by H 2   (d) Sn can be oxidized by Cu
2+ 
 
5. The oxidation potential of hydrogen half-cell will be negative if: 
(a) p(H 2) = 1 atm and [H
+
] = 1 M  (b) p(H 2) = 1 atm and [H
+
] = 2 M 
(c) p(H 2) = 0.2 atm and [H
+
] = 1 M  (d) p(H 2) = 0.2 atm and [H
+
] = 0.2 M 
 
6. Which of the following arrangement will produce oxygen at anode during electrolysis? 
(a) Dilute H 2SO 4 with Pt electrodes  (b) Fused NaOH with inert electrodes 
(c) Dilute H 2SO 4 with Cu electrodes  (d) Concentrate aq. NaCl with Pt electrodes 
 
7. When an aqueous concentrate solution of lithium chloride is electrolyzed using inert electrodes: 
(a) Cl 2 is liberated at the anode 
(b) Li is deposited at the cathode 
(c)  As the correct flows, pH of the solution around the cathode remains constant  
(d) As the correct flows, pH of the solution around the cathode increases 
 
8. Oxygen and hydrogen gas are produced at the anode and cathode during the electrolysis of fairly 
concentrate aqueous solution of: 
(a) K 2SO 4  (b) AgNO 3  (c) H 2SO 4  (d) NaOH 
9. During the purification of copper by electrolysis: 
(a) The anode used is mode of copper ore 
(b) Pure copper is deposited on the cathode 
(c) The impurities such as Ag, Au present in solution as ions 
(d) Concentration of CuSO 4 solution remains constant during dissolution Cu 
 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
10. When a lead storage battery is discharged: 
(a) SO 2 is evolved    (b) Lead sulphate is produced at both electrodes 
(c) Sulphuric acid is consumed   (d) Water is formed 
 
11. Which of the following is characteristic of the cathode in a voltaic cell? 
(a) It may gain weight during reaction (b) Electrons flow to it through the external circuit 
(c) It is where oxidation occurs  (d) It received electrons from ions in solution 
 
12. In an electrochemical process, a salt bridge is used: 
(a) To maintain electrical neutrality in each solution 
(b) To complete the external circuit so that current can flow for long time. 
(c)  To mix the solution of anodic and cathodic compartment 
(d) To supply voltage 
13. For a reaction in a galvanic cell the value of - ?G
0
 at certain temperature is not necessarily equal 
to:  
(a) nFE
0
  (b) RT ln K  (c) T ?S
0
 - ?H
0
  (d) zero 
14. Standard electrode potential of two half-reactions are given below: 
20
Fe Fe E 0.44 V
?
?? 
3 2 0
Fe Fe E 0.77 V
??
?? 
 If Fe
2+
, Fe
3+
 and Fe are kept together: 
 (a) The concentration Fe
3+
 increases  (b) The concentration Fe
3+
 decreases 
 (c) The mass of Fe increases   (d) The concentration Fe
2+
 decreases   
 
15. Which of the following statements are correct regarding to galvanic cell? 
(a) A reaction is spontaneous from left to right if E cell > 0 
(b) A reaction occurs from right of left if E cell < 0 
(c) If the system is at equilibrium no net reaction occurs 
(d) E cell is temperature-independent 
16. Which of the following are concentration cells? 
(a) Pt | H 2(g)P 1 || HCl | H 2(g)P 2 | Pt           (b) Cd, (Hg)a 1 || Cd
2+
c | (Hg)a 2,Cd 
(c)  Zn(s) |Zn
2+
c 1 || Cu
2+
c 2 | Cu    (d)Ag|AgCl|Cl
-
(aq)c 1||Br
-
(aq)c 2|AgBr|Ag   
17. In electrolyte concentration cell: 
(a) The electrode material and the solution in both half –cells are composed of the same 
substances 
(b) Only the concentrations of solutions of the same substances is different  
(c) E
0
cell = 0 
(d) The Nernst equation reduces to E cell = 
0.0591
n
??
?
??
??
 log Q at 25
0
C 
 
 
 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
18. The standard electrode potential of a metal-metal ion (Ag|Ag
+
) and metal-sparingly soluble salt 
anion (Ag|AgCl|Cl
-
) are related as: 
(a) 
00
sp
Ag |Ag Cl |AgCl|Ag
RT
E E In K
F
??
?? (b) 
00
sp
Cl |AgCl|Ag Ag |Ag
RT
E E In K
F
??
?? 
(c) 
00
Cl |AgCl|Ag Ag |Ag
sp
RT [Cl ]
E E In
FK
??
?
?? (d) 
sp
00
Cl |AgCl|Ag Ag |Ag
K
RT
E E In
F
[Cl ]
??
?
?? 
19. Which of the following units is currectly matched? 
(a) SI units of conductivity is S m
-1-  
(b) SI units of molar conductivity is S cm
2
 mol
-1 
(c) SI unit of conductivity is S
-1   
(d) All of these 
 
20. Which of the following statement is/are correct? 
(a) The conductance of one cm
3
 (or 1 unit
3
) of a solution is called specific conductance 
(b) Specific conductance increases while molar conductively decreases on progressive dilution 
(c) The limiting equivalent conductivity of weak electrolyte cannot be determine exactly by 
extrapolation of the plot of ?
eq against c 
(d) The conductance of metals is due to the movement of free electrons  
 
21. Which is/are correct statement? 
(a) No corrosion takes place in vacuum 
(b) Corrosion protecting by electroplating  
(c) During rusting Fe 2O 3.xH 2O formed 
(d) In presence of electrolyte,corrosion takes place with grater rate  
 
22. A dilute solution of KCl was placed between two Pt electrode 10 cm apart across which a 
potential difference of 10 volt was applied. Which is/are correct statement (Given : molar 
conductivity of K
+
 at infinite dilution is 96.5 Scm
2
 mol
-1
.) 
Which is/are correct statement? 
(a) Ionic mobility of K
+
 is 10
-3
 cm
2
 sec
-1
 volt
-1 
(b) The speed of K
+
 is 10
-3
 cm sec
-1
 
(c) Distance travelled by K
+
 is 5×10
3
 sec is 5 cm (d) The potential gradient is 1.0 volt cm
-1 
 
23. Given : Pt (s) | H 2 (g)1bar | 0.1 M NH 4OH (aq) || 0.1 M CH 3COOH (aq) | H 2 (g)1bar|Pt (s) 
pK b (NH 4OH) = 5; pK a (CH 3COOH) = 5; 
2.303RT
F
 = 0.06 
Volume of 0.1 M NH 4OH in anode half cell = 100 mL, 
Volume of 0.1 M CH 3COOH in cathode half cell = 100 mL, 
 Which is/are correct statement? 
(a) The emf of given cell is 0.48 V. 
(b) The emf of given cell is 0.36 V when 50 mL, 0.1 M NaOH added to cathode compartment  
(c) The emf of given cell is 0.36 V when 50 mL, 0.1 M HCl added to anode compartment  
(d) The emf of given cell is 0.192 V when 100 mL, 0.1 M NaOH added to cathode compartment  
Page 4


 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
MULTIPLE SELECT QUESTION  ELECTROCHEMISTRY   IIT JAM 
1. If the e.m.f of a galvanic cell is negative, it implies that: 
(a) The cell reaction is spontaneous  (b) The cell reaction is non-spontaneous 
(c) The cell reaction is exothermic (d) The cell reaction is working in reverse direction 
 
2. Select right statement(s) about electrolysis: 
(a) Electric correct is used to drive a non-spontaneous reaction 
(b) ?G is positive for chemical process during electrolysis 
(c) Cations and anions are moved toward the anode and cathode respectively 
(d) Over voltage is generally associated with evolution of O 2 gas 
 
3. If the half-cell reaction A + e
-
 ? A
-
 has a large negative reduction potentials, if follows that: 
(a) A is readily reduced    (b) A is readily oxidized 
(c) A
-
 is readily reduced    (d) A
-
 is readily oxidized 
4. Which of the following statement is correct? 
If  E
0
Cu
2+
| Cu = 0.34 V and E
0
Sn
2+
| Sn = - 0.136 V,  E
0
H
+
| 
2
H
 = 0.0 V 
(a) Cu
2+
 ions can be reduced by H 2 (g)  (b) Cu ions can be oxidized by H
+
 
(c) Sn
2+
 ions can be reduced by H 2   (d) Sn can be oxidized by Cu
2+ 
 
5. The oxidation potential of hydrogen half-cell will be negative if: 
(a) p(H 2) = 1 atm and [H
+
] = 1 M  (b) p(H 2) = 1 atm and [H
+
] = 2 M 
(c) p(H 2) = 0.2 atm and [H
+
] = 1 M  (d) p(H 2) = 0.2 atm and [H
+
] = 0.2 M 
 
6. Which of the following arrangement will produce oxygen at anode during electrolysis? 
(a) Dilute H 2SO 4 with Pt electrodes  (b) Fused NaOH with inert electrodes 
(c) Dilute H 2SO 4 with Cu electrodes  (d) Concentrate aq. NaCl with Pt electrodes 
 
7. When an aqueous concentrate solution of lithium chloride is electrolyzed using inert electrodes: 
(a) Cl 2 is liberated at the anode 
(b) Li is deposited at the cathode 
(c)  As the correct flows, pH of the solution around the cathode remains constant  
(d) As the correct flows, pH of the solution around the cathode increases 
 
8. Oxygen and hydrogen gas are produced at the anode and cathode during the electrolysis of fairly 
concentrate aqueous solution of: 
(a) K 2SO 4  (b) AgNO 3  (c) H 2SO 4  (d) NaOH 
9. During the purification of copper by electrolysis: 
(a) The anode used is mode of copper ore 
(b) Pure copper is deposited on the cathode 
(c) The impurities such as Ag, Au present in solution as ions 
(d) Concentration of CuSO 4 solution remains constant during dissolution Cu 
 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
10. When a lead storage battery is discharged: 
(a) SO 2 is evolved    (b) Lead sulphate is produced at both electrodes 
(c) Sulphuric acid is consumed   (d) Water is formed 
 
11. Which of the following is characteristic of the cathode in a voltaic cell? 
(a) It may gain weight during reaction (b) Electrons flow to it through the external circuit 
(c) It is where oxidation occurs  (d) It received electrons from ions in solution 
 
12. In an electrochemical process, a salt bridge is used: 
(a) To maintain electrical neutrality in each solution 
(b) To complete the external circuit so that current can flow for long time. 
(c)  To mix the solution of anodic and cathodic compartment 
(d) To supply voltage 
13. For a reaction in a galvanic cell the value of - ?G
0
 at certain temperature is not necessarily equal 
to:  
(a) nFE
0
  (b) RT ln K  (c) T ?S
0
 - ?H
0
  (d) zero 
14. Standard electrode potential of two half-reactions are given below: 
20
Fe Fe E 0.44 V
?
?? 
3 2 0
Fe Fe E 0.77 V
??
?? 
 If Fe
2+
, Fe
3+
 and Fe are kept together: 
 (a) The concentration Fe
3+
 increases  (b) The concentration Fe
3+
 decreases 
 (c) The mass of Fe increases   (d) The concentration Fe
2+
 decreases   
 
15. Which of the following statements are correct regarding to galvanic cell? 
(a) A reaction is spontaneous from left to right if E cell > 0 
(b) A reaction occurs from right of left if E cell < 0 
(c) If the system is at equilibrium no net reaction occurs 
(d) E cell is temperature-independent 
16. Which of the following are concentration cells? 
(a) Pt | H 2(g)P 1 || HCl | H 2(g)P 2 | Pt           (b) Cd, (Hg)a 1 || Cd
2+
c | (Hg)a 2,Cd 
(c)  Zn(s) |Zn
2+
c 1 || Cu
2+
c 2 | Cu    (d)Ag|AgCl|Cl
-
(aq)c 1||Br
-
(aq)c 2|AgBr|Ag   
17. In electrolyte concentration cell: 
(a) The electrode material and the solution in both half –cells are composed of the same 
substances 
(b) Only the concentrations of solutions of the same substances is different  
(c) E
0
cell = 0 
(d) The Nernst equation reduces to E cell = 
0.0591
n
??
?
??
??
 log Q at 25
0
C 
 
 
 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 011-47455430, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
18. The standard electrode potential of a metal-metal ion (Ag|Ag
+
) and metal-sparingly soluble salt 
anion (Ag|AgCl|Cl
-
) are related as: 
(a) 
00
sp
Ag |Ag Cl |AgCl|Ag
RT
E E In K
F
??
?? (b) 
00
sp
Cl |AgCl|Ag Ag |Ag
RT
E E In K
F
??
?? 
(c) 
00
Cl |AgCl|Ag Ag |Ag
sp
RT [Cl ]
E E In
FK
??
?
?? (d) 
sp
00
Cl |AgCl|Ag Ag |Ag
K
RT
E E In
F
[Cl ]
??
?
?? 
19. Which of the following units is currectly matched? 
(a) SI units of conductivity is S m
-1-  
(b) SI units of molar conductivity is S cm
2
 mol
-1 
(c) SI unit of conductivity is S
-1   
(d) All of these 
 
20. Which of the following statement is/are correct? 
(a) The conductance of one cm
3
 (or 1 unit
3
) of a solution is called specific conductance 
(b) Specific conductance increases while molar conductively decreases on progressive dilution 
(c) The limiting equivalent conductivity of weak electrolyte cannot be determine exactly by 
extrapolation of the plot of ?
eq against c 
(d) The conductance of metals is due to the movement of free electrons  
 
21. Which is/are correct statement? 
(a) No corrosion takes place in vacuum 
(b) Corrosion protecting by electroplating  
(c) During rusting Fe 2O 3.xH 2O formed 
(d) In presence of electrolyte,corrosion takes place with grater rate  
 
22. A dilute solution of KCl was placed between two Pt electrode 10 cm apart across which a 
potential difference of 10 volt was applied. Which is/are correct statement (Given : molar 
conductivity of K
+
 at infinite dilution is 96.5 Scm
2
 mol
-1
.) 
Which is/are correct statement? 
(a) Ionic mobility of K
+
 is 10
-3
 cm
2
 sec
-1
 volt
-1 
(b) The speed of K
+
 is 10
-3
 cm sec
-1
 
(c) Distance travelled by K
+
 is 5×10
3
 sec is 5 cm (d) The potential gradient is 1.0 volt cm
-1 
 
23. Given : Pt (s) | H 2 (g)1bar | 0.1 M NH 4OH (aq) || 0.1 M CH 3COOH (aq) | H 2 (g)1bar|Pt (s) 
pK b (NH 4OH) = 5; pK a (CH 3COOH) = 5; 
2.303RT
F
 = 0.06 
Volume of 0.1 M NH 4OH in anode half cell = 100 mL, 
Volume of 0.1 M CH 3COOH in cathode half cell = 100 mL, 
 Which is/are correct statement? 
(a) The emf of given cell is 0.48 V. 
(b) The emf of given cell is 0.36 V when 50 mL, 0.1 M NaOH added to cathode compartment  
(c) The emf of given cell is 0.36 V when 50 mL, 0.1 M HCl added to anode compartment  
(d) The emf of given cell is 0.192 V when 100 mL, 0.1 M NaOH added to cathode compartment  
 
 
 
 
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24. Given : Pt (s) | Cl 2 (g)p 1 | Cl
-
 (C 1)|| Cl
-
 (C 2)| Cl 2 (g)p 2 |Pt (s)  
Identify in which of following condition working of cell takes place: 
(a) C 1 > C 2 and P 1 = P 2   (b) P 2 > P 1 and C 1 = C 2 
(c) C 1 < C 2 and P 1 = P 2   (d) P 2 < P 1 and C 1 = C 2 
 
25. 1000 mL 1 M CuSO 4 (aq) is electrolyzed by 9.65 amp current for 100 sec using Pt-electrode.  
Which is/are correct statement? 
(a) Blue colour intensity decreases during electrolysis 
(b) Blue colour intensity remains constant if Cu-electrode used. 
(c) pH of solution is 8 after electrolysis. 
(d) 28 mL of CH 4 at 1 atm and 273 K required to its combustion by O 2, liberated during 
electrolysis.  
 
 ANSWER KEY 
1.bd 2.abd 3.d 4ad 5bc 
6.ab 7.ad 8.acd 9.abd 10.bcd 
11.ab 12.a 13.bd 14.b 15.abc 
16.abd 17.abcd 18.b 19.a 20.acd 
21.abcd 22.abcd 23.abc 24.ab 25.abd