Entry Test Preparation 2015
Chemistry
Chapter # 10
MCQS
ELECTROCHEMISTRY
1. A cell in which spontaneous redox reaction generates an
electric current is called.
(a)
electrolytic cell (b)
electrochemical cell
(c)
voltaic or galvanic cell (d)
biological cell
2. A cell in which an electric current drives a non-spontaneous
reaction is called.
(a)
electrolytic cell (b) voltaic cell (c) biological cell (d) electrochemical cell
3. A process for coating one metal with a thin layer of another
metal is called.
(a)
electrolysis (b)
electroplating (c) electrode
potential (d) standard electrode
4. Greater the value of standard reduction potential of a
species indicates.
(a)
greater its tendency to accept electrons.
(b)
lesser tendency to accept electrons.
(c)
greater tendency to lose electrons.
(d)
none of these
5. In lead accumulator the electrolyte H2SO4
solution is.
(a)
30% (b) 60% H2SO4 (c) 80% (d) 90%
6. In alkaline battery, the electrolyte contains.
(a)
MnO2 (b)
KOH (c) NaCl (d) NaNO3
7. Strong reducing agents have.
(a)
greater positive value of standard reduction potential.
(b)
greater negative value of standard reduction potential.
(c)
lesser positive value of standard reduction potential.
(d)
none of these
8. Strong oxidizing agents have.
(a)
greater positive value of standard reduction potential.
(b)
greater negative value of standard reduction potential.
(c)
lesser positive value of standard reduction potential.
(d)
none of these
9. Metals which are above than SHE in electrochemical series.
(a)
can liberate H2 from acid (b)
cannot liberate H2 from acid
(c)
cannot always liberate H2 from acid (d)
none of these
10. Corrosion reactions are:
(a)
spontaneous redox reaction (b)
non-spontaneous acid-base reactions
(c)
spontaneous acid-base reactions (d)
none of these
11. Strongest reducing agent in the electrochemical series is.
(a)
Li (b) F (c) H2 (d) I2
12. The value of SHE as cathode and anode is always taken to be.
(a)
One (b) Zero (c) Different (d) Same
13. In SHE the standard is the _____ atom.
(a)
H (b) C (c) N (d) O
14. In cells, metal oxides usually act as.
(a)
electrolytes (b) anode (c) cathode (d) all of these
15. The tendency of an element to form ions in solution is called.
(a)
Cell potential (b) Ionization
potential (c) Electrode potential (d) None
16. The oxidation number of free element is always taken to be.
(a)
0 (b) 1 (c) 2 (d) -1
17. Oxidation occurs at:
(a)
Anode (b) Cathode (c) Both a & b (d) Electrolyte
18. Zinc-copper galvanic cell may be formed by.
(a)
Salt bridge (b) Porous
partition (c) Both a & B (d) None of these
19. While Balancing an equation by ion
electron method the number of oxygen atoms are balanced in acidic media by
using:
(a)
OH-
20. A cell in which electrical energy is converted to chemical
energy is called.
(a)
Electrolytic cell (b) Galvanic cell (c) Fuel cell (d) Dry cell
21. The process in which electric current is
used to carry out non-spontaneous redox reaction, is called as.
(a) Hydrolysis (b) Electrolysis (c) Decomposition (d) Neutralization
22. In the electrolysis of aqueous solution
of NaCl, which is produced at graphite anode.
(a) H2 gas (b) Cl2 (c) NaOH (d) Na metal
23. Which will produce at cathode, in the
electrolysis of aqueous solution of CuSO4.
(a) H2SO4 (b) Oxygen (c) Copper (d) Cu2+ ions
24. An electrochemical cell in which a
spontaneous oxidation reduction reaction generates electric current is called.
(a) Electrolytic cell (b) Galvanic or Voltaic cell (c) Dry cell (d) All of the above
25. Electric current travels in metals due to
the reaction?
(a) Oxidation reaction (b)
Reducation reaction
(c) Electrolysis
(d)
Free movement of electrons
26. The electrolyte use in the process of purification of impure
copper is.
(a)
H2SO4 (b)
CuSO4 (c)
ZnSO4 (d) Na2SO4
27. The process of coating of one metal on the other is called as:
(a)
Electroplating (b0 Electrolysis (c) Conduction (d) Induction
28. The two half cells of galvanic cells are connected
electronically by:
(a)
Ammeter (b) Salt bridge (c) Hydrogen electrode (d) Induction
motor
29. The function of salt bridge in the galvanic cell is to.
(a)
Carry out oxidation at anode.
(b)
Carry out reduction at anode.
(c)
Carryout electrolysis
(d)
Prevent the net charge accumulation in either of the half cells.
30. In voltaic cell the electrode reactions are reversed when.
(a)
Salt bridge is removed.
(b)
Voltaic cell is connected to SHE
(c)
External circuit is replaced by a source of electricity.
(d)
H2SO4 is added to cells.
31. When a metal is dipped in its one molar solution at 298 K,
then potential setup is called.
(a)
Standard electrode potential (b)
Electric charge
(c)
Ionization potential (d) Electroplating
32. The oxidation number of carbon in C12H22O11
is:
(a) Zero (b) 11 (c)
12 (d)
22
33. The product obtained at cathode during
electrolysis of brine is:
(a) Na-metal (b) Cl2 (c)
H2 (d)
NaOH
34. The reduction potential values for Zn and
Cu are -0.76v and 0.34 v respectively. The standard electrode potential of the
cell in the reaction Zn + Cu2+ à
Zn2+ + Cu will be:
(a) 1.10 volt (b) -1.10 volt (c) 0.42 volt (d) -0.42 volt
35. In which of the following cell, non-alkaline electrolyte is
used:
(a)
Alkaline battery (b) Lead Acid
Accumulator battery
(c) NICAD
battery (d) Silver oxide battery
36. In which compound oxidation no. of nitrogen is maximum.
(a)
NH3 (b)
N2O (c)
NO2 (d)
N2O3
37. If two or more than two substances appear
to have nearly equal strengths in same solvent, then the phenomenon is called.
(a) Reduction (b) Oxidation (c) Solvation (d) Levelling effect
38. The oxidation number of oxygen is minimum
in:
(a) H2O2 (b) KO2 (c) OF2 (d) Na2O
39. Which statement is incorrect about
standard hydrogen electrode (SHE)
(a) Its oxidation and reduction
potential is zero.
(b) It consists of a Pt wire dipped
in 1 molar HCl solution
(c) The electrolyte is 1 molar NaOH
solution.
(d) H2 gas is passed in it
at 1 atmospheric pressure
40. Indicate the spontaneous reaction.
(a) MgCl2 + Zn 
ZnCl2
+ Mg
ZnCl2
+ Mg
(b) Pb + 2AgNO3 Pb (NO3)2
+ 2Ag
Pb (NO3)2
+ 2Ag
(c) 2AlCl3 2Al + 3 Cl2
2Al + 3 Cl2
(d) l2 + 2KCl 2Kl + Cl2
2Kl + Cl2
41. Alkaline battery has a voltage of.
(a) 4.5 V (b) 3.5 V (c)
2.5 V (d) 1.5 V
42. After recharging of car battery the
density of H2SO4 is.
(a) 1.0g cm-3 (b) 1.15g cm-3 (c) 1.25g cm-3 (d) 2.15g cm-3
43. A dry alkaline cell has porous Zn anode
and MnO2 as cathode the electrolyte used is.
(a) Ca(OH)2 (b) NaOH (c) KOH (d)
NH4OH
44. In electronic watches, the tiny batteries
used are:
(a) Alkaline battery (b0 NICAD battery (c) Fuel cell (d) Silver
Oxide battery
45. Silver oxide battery has a voltage of.
(a) 2.0 V (b) 1.5 V (c)
2.5 V (d) 1.0 V
46. Lead accumulator contains as electrolyte.
(a) 30% NaCl solution (b) 30 % HCl
solution
(c) 30% H2SO4
solution (d)
30% NaOH solution
47. Lead accumulator is said be discharged
when.
(a) Lead at anode is converted to
PbO2
(b) PbO2
at cathode is converted to PbO4
(c) Both electrodes are completely
covered with PbSO4
(d) Both electrodes are completely
covered with Pb(OH)2
48. Which statement is incorrect for NICAD
battery.
(a) The electrolyte is alkali (b) Cd acts as
anode
(c) MnO2 acts are
electrolyte (b)
NiO2 acts as cathode
49. The oxidation number of H is -1 in the
compound.
(a) H2O (b) H3BO3 (c) NaOH (d) NaH
50. In OF2 the oxidation state of
oxygen is.
(a) -2 (b) -1 (c)
+1 (d) +2
ANSWERS
(electrochemistry)
1
|
A
|
2
|
A
|
3
|
C
|
4
|
A
|
5
|
B
|
6
|
C
|
7
|
A
|
8
|
B
|
9
|
A
|
10
|
D
|
11
|
A
|
12
|
C
|
13
|
D
|
14
|
D
|
15
|
B
|
16
|
B
|
17
|
D
|
18
|
A
|
19
|
D
|
20
|
A
|
21
|
D
|
22
|
D
|
23
|
C
|
24
|
D
|
25
|
B
|
26
|
C
|
27
|
D
|
28
|
D
|
29
|
D
|
30
|
B
|
31
|
B
|
32
|
A
|
33
|
D
|
34
|
C
|
35
|
C
|
36
|
C
|
37
|
B
|
38
|
B
|
39
|
C
|
40
|
B
|
41
|
C
|
42
|
B
|
43
|
C
|
44
|
B
|
45
|
A
|
46
|
D
|
47
|
C
|
48
|
C
|
49
|
A
|
50
|
A
|
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