Refer to CBSE Class 12 Chemistry Electrochemistry MCQs provided below available for download in Pdf. The MCQ Questions for Class 12 Chemistry with answers are aligned as per the latest syllabus and exam pattern suggested by CBSE, NCERT and KVS. Multiple Choice Questions for Chapter 3 Electrochemistry are an important part of exams for Class 12 Chemistry and if practiced properly can help you to improve your understanding and get higher marks. Refer to more Chapter-wise MCQs for CBSE Class 12 Chemistry and also download more latest study material for all subjects
MCQ for Class 12 Chemistry Chapter 3 Electrochemistry
Class 12 Chemistry students should refer to the following multiple-choice questions with answers for Chapter 3 Electrochemistry in Class 12.
Chapter 3 Electrochemistry MCQ Questions Class 12 Chemistry with Answers
Question : Effect of dilution on conductivity of solution:
a) Increases
b) Decreases
c) Unchanged
d) None of the above
Answer : A
Question : Through a solution of CuSO4 a current of 3 amperes was passed for 2 hours. At cathode 3 g of Cu2+ions were discharged. The current efficiency is [At. wt. of Cu = 63.5]
a) 33.3%
b) 42.2%
c) 48.7%
d) 54.4%
Answer : B
Question : Which shows electrical conductance?
a) Sodium
b) Diamond
c) Potassium
d) Graphite
Answer : D
Question : Which of the following reactions is used to make a fuel cell?
Answer : C
Question : Time required to deposit one millimole of aluminium metal by the passage of 9.65 amperes through aqueous solution of aluminium ion is
a) 30 s
b) 10 s
c) 30,000 s
d) 10,000 s
Answer : A
Question : The products formed when an aqueous solution of NaBr is electrolysed in a cell having inert electrodes are:
a) Na and Br2
b) Na and O2
c) H2 ,Br2 and NaOH
d) H2 and O2
Answer : C
Question : Equivalent conductance of an electrolyte containing NaF at infinite dilution is 90.1 Ohm–1cm2. If NaF is replaced by KF what is the value of equivalent conductance?
a) 90.1 Ohm–1cm2
b) 111.2 Ohm–1cm2
c) 0
d) 222.4 Ohm–1cm2
Answer : A
Question : For a cell reaction involving two electron change, the standard EMF of the cell is 0.295 V at 2°C. The equilibrium constant of the reaction at 25°C will be
a) 29.5 × 10–2
b) 10
c) 1 × 1010
d) 2.95 × 10–10
Answer : C
Question : A 0.5 M NaOH solution offers a resistance of 31.6 ohm in a conductivity cell at room temperature. What shall be the approximate molar conductance of this NaOH solution if cell constant of the cell is 0.367 cm–1.
a) 234 S cm2 mole–1
b) 23.2 S cm2 mole–1
c) 4645 S cm2 mole–1
d) 5464 S cm2 mole–1
Answer : D
Question : Which of the following statements is incorrect regarding electrochemistry?
a) It is the study of production of electricity from energy released during spontaneous chemical reactions.
b) NaOH, Cl2, alkali and alkaline earth metals are prepared by electrochemical methods.
c) The demerit associated with electrochemical methods is that they are more polluting. Thus they are ecodestructive.
d) Electrochemical reactions are more energy efficient and less polluting.
Answer : C
Question : What flows in the internal circuit of a galvanic cell?
a) Ions
b) Electrons
c) Electricity
d) Atoms
Answer : A
Question : Which of the following statements about galvanic cell is incorrect
a) anode is positive
b) oxidation occurs at the electrode with lower reduction potential
c) cathode is positive
d) reduction occurs at cathode
Answer : A
Question : Reaction that takes place at graphite anode in dry cell is
a) Zn2+ + 2e+ →Zn(s)
b) Zn(s)→Zn2+ + 2e-
c) Mn2+ + 2e- →Mn(s)
d) Mn(s)→Mn- + e- +1.5V
Answer : B
Question : In which of the following conditions salt bridge is not required in a galvanic cell?
a) When galvanic cell is used in geyser.
b) When distance between oxidation half cell and reduction half cell is negligible.
c) Electrolytic solutions used in both the half cells are of same concentration.
d) When both the electrodes are dipped in the same electrolytic solution.
Answer : D
Question : Which device converts chemical energy of a spontaneous redox reaction into electrical energy?
a) Galvanic cell
b) Electrolytic cell
c) Daniell cell
d) Both a) and c)
Answer : D
Question : To deposit one equivalent weight of silver at cathode, the charge required will be
a) 9.65 × 104 C
b) 9.65 × 103 C
c) 9.65 × 105 C
d) 9.65 × 107 C
Answer : A
Question : The volume of oxygen gas liberated at NTP by passing a current of 9650 coulombs through acidified water is
a) 1.12 litre
b) 2.24 litre
c) 11.2 litre
d) 22.4 litre
Answer : B
Question : Three faradays electricity was passed through an aqueous solution of iron (II) bromide. The weight of iron metal (at. wt = 65) deposited at the cathode (in gm) is
a) 56
b) 84
c) 112
d) 168
Answer : B
Question : Faraday’s laws of electrolysis will fail when
a) temperature is increased
b) inert electrodes are used
c) a mixture of electrolytes is used
d) None of these cases
Answer : D
Question : The electric charge for electrode decomposition of one gram equivalent of a substance is
a) one ampere per second
b) 96500 coulombs per second
c) one ampere for one hour
d) charge on one mole of electrons
Answer : D
Question : In electrolysis of dilute H2SO4 using platinum electrodes
a) H2 is evolved at cathode
b) NH2 is produced at anode
c) Cl2 is obtained at cathode
d) O2 is produced
Answer : A
Question : The difference between the electrode potentials of two electrodes when no current is drawn hrough the cell iscalled _________.
a) Cell potentials
b) Cell emf
c) Potential difference
d) Cell voltage
Answer : B
Question : Which of the following pair(s) is/are incorrectly matched?
(i) R (resistance) – ohm (Ω)
(ii) (resistivity) – ohm metre (Ωm)
(iii) G (conductance) – seimens or ohm (S)
(iv) (conductivity) – seimens metre–1 (Sm–1)
a) (i), (ii) and (iii)
b) (ii) and (iii)
c) (i), (ii) and (iv)
d) (iii) only
Answer : C
Question : The reference electrode is made by using
a) ZnCl2
b) CuSO4
c) HgCl2
d) Hg2Cl2
Answer : D
Question : The standard hydrogen electrode potential is zero, because
a) hydrogen oxidized easily
b) electrode potential is considered as zero
c) hydrogen atom has only one electron
d) hydrogen is a very light element
Answer : B
Question : Without losing its concentration ZnCl2 solution cannot be kept in contact with
a) Au
b) Al
c) Pb
d) Ag
Answer : B
Question : On the basis of the following E° values, the strongest oxidizing agent is :
[Fe(CN)6]4– +[Fe(CN)6]3– + e– ; E° = – 0.35 V
Fe2+ → Fe3+ + e–; E° = – 0.77 V
a) [Fe(CN)6]4–
b) Fe2+
c) Fe3+
d) [Fe(CN)6]3–
Answer :C
Question : Standard electrode potential of three metals X, Y and Z are – 1.2 V, + 0.5 V and – 3.0 V, espectively. The reducing powerbof these metals will be :
a) Y > Z > X
b) X > Y > Z
c) Z > X > Y
d) X > Y > Z
Answer : C
Question : Standard electrode potential for Sn4+ / Sn2+ couple is + 0.15 V and that for the Cr3+ / Cr couple is – 0.74 V. These two couples in their standard state are connected to make a cell. The cell potential will be
a) + 1.19 V
b) + 0.89 V
c) + 0.18 V
d) + 1.83 V
Answer : B
Question : Standard reduction potentials of the half reactions are given below :
F2(g) + 2e– → 2F– (aq); E° = + 2.85 V
Cl2(g) + 2e– → 2Cl–(aq); E° = + 1.36 V
Br2(l) + 2e– → 2Br–(aq); E° = + 1.06 V
I2(s) + 2e– → 2I–(aq); E° = + 0.53 V
The strongest oxidising and reducing agents respectively are
a) F2 and I–
b) Br2 and Cl–
c) Cl2 and Br–
d) Cl2 and I2
Answer : A
Question : A button cell used in watches functions as following
Zn(s) + Ag2O(s) + H2O(l)
2Ag(s) + Zn2+(aq) + 2OH–(aq)
If half cell potentials are :
Zn2+(aq) + 2e– → Zn(s); Eo = – 0.76 V
Ag2O(s) + H2O (l) + 2e– → 2Ag(s) + 2OH–(aq); Eo = 0.34 V
The cell potential will be :
a) 0.42 V
b) 0.84 V
c) 1.34 V
d) 1.10 V
Answer : D
Question : The oxidation potentials of A and B are +2.37 and +1.66 V respectively. In chemical reactions
a) A will be replaced by B
b) A will replace B
c) A will not replace B
d) A and B will not replace each other
Answer : B
Question : A smuggler could not carry gold by depositing iron on the gold surface since
a) gold is denser
b) iron rusts
c) gold has higher reduction potential than iron
d) gold has lower reduction potential than iron
Answer : B
Question : Which cell will measure standard electrode potential of copper electrode ?
a) Pt (s) |H2 (g, 0.1 bar) |H+ (aq., 1 M) ||Cu2+ (aq., 1 M) | Cu
b) Pt (s) |H2 (g, 1 bar) |H+ (aq., 1 M) ||Cu2+ (aq., 2 M) | Cu
c) Pt (s) |H2 (g, 1 bar) |H+ (aq., 1 M) ||Cu2+ (aq., 1 M) | Cu
d) Pt (s) |H2 (g, 1 bar) |H+ (aq., 0.1 M) ||Cu2+ (aq., 1 M) | Cu
Answer : C
Question : Which of the following statement is not correct about an inert electrode in a cell ?
a) It does not participate in the cell reaction.
b) It provides surface either for oxidation or for reduction reaction.
c) It provides surface for conduction of electrons
d) It provides surface for redox reaction.
Answer : D
Question : In the electrochemical reaction 2Fe3+ + Zn→Zn2+ + 2Fe2+ , on increasing the concentration of Fe2+
a) increases cell emf
b) increases the current flow
c) decreases the cell emf
d) alters the pH of the solution
Answer : C
Question : The standard e.m.f. of a galvanic cell involving cell reaction with n = 2 is found to be 0.295 V at 25°C. The equilibrium constant of the reaction would be (Given F = 96500 C mol–1; R = 8.314JK–1mol–1)
a) 2.0x1011
b) 4.0x1012
c) 1.0x102
d) 1.0x1010
Answer : D
Question : On electrolysis of dilute sulphuric acid using platinum electrodes, the product obtained at the anode will be
a) hydrogen
b) oxygen
c) hydrogen sulphide
d) Sulphur dioxide
Answer : B
Question : If 0.5 amp current is passed through acidified silver nitrate solution for 100 minutes. The mass of silver deposited oncathode, is (eq.wt.of silver nitrate = 108)
a) 2.3523 g
b) 3.3575 g
c) 5.3578 g
d) 6.3575 g
Answer : B
Question : Molar ionic conductivities of a two-bivalent electrolytes x2+ and y2- are 57 and 73 respectively. The molar conductivity of the solution formed by them will be
a) 130 S cm2 mol–1
b) 65 S cm2 mol–1
c) 260 S cm2 mol–1
d) 187 S cm2 mol–1
Answer : A
Question : The standard emf of a cell, involving one electron change is found to be 0.591 V at 25°C. The equilibrium constant of the reaction is (F = 96500 C mol–1)
a) 1.0 × 101
b) 1.0 × 105
c) 1.0 × 1010
d) 1.0 ×1030
Answer : C
Question : For the galvanic cell
Zn | Zn2+ (0.1M) || Cu2+ (1.0M)|Cu the cell potential increase if:
a) [Zn2+] is increased
b) [Cu2+] is increased
c) [Cu2+] is decreased
d) surface area of anode is increased
Answer : B
Question : Which of the following is the use of electrolysis?
a) Electrorefining
b) Electroplating
c) Both a) & b)
d) None of these
Answer : D
Question : An electrolytic cell contains a solution of Ag2SO4 and has platinum electrodes. A current is passed until 1.6 gm of O2 has been liberated at anode. The amount of silver deposited at cathode would be
a) 107.88 gm
b) 1.6 gm
c) 0.8 gm
d) 21.60 gm
Answer : D
Question : When 9650 coulombs of electricity is passed through a solution of copper sulphate, the amount of copper deposited is (given at. wt. of Cu = 63.6)
a) 0318g
b) 3.18 g
c) 31.8g
d) 63.6g
Answer : B
Question : Find the charge in coulombs required to convert 0.2 mole VO3 –2 into VO4 –3 –
a) 1.93 × 104
b) 9.65 × 104
c) 1.93 × 105
d) 9.65 × 105
Answer : A
Question : A silver cup is plated with silver by passing 965 coulombs of electricity. The amount of Ag deposited is :
a) 107.89 g
b) 9.89 g
c) 1.0002 g
d) 1.08 g
Answer : D
Question : The number of coulombs required to reduce 12.3 g of nitrobenzene to aniline is :
a) 115800 C
b) 5790 C
c) 28950 C
d) 57900 C
Answer : D
Question : The amount of electricity that can deposit 108 g of Ag from AgNO3 solution is:
a) 1 F
b) 2 A
c) 1 C
d) 1 A
Answer : A
Question : If 0.01 M solution of an electrolyte has a resistance of 40 ohms in a cell having a cell constant of 0.4 cm–1, then its molar conductance in ohm–1 cm2 mol–1 is
a) 102
b) 104
c) 10
d) 103
Answer : D
Question : Specific conductance of a 0.1 N KCl solution at 23ºC is 0.012 ohm–1 cm–1. Resistance of cell containing the solutionat same temperature was found to be 55 ohm. The cell constant is
a) 0.0616 cm–1
b) 0.66 cm–1
c) 6.60 cm–1
d) 660 cm–1
Answer : B
Question : The unit of equivalent conductivity is
a) ohm cm
b) ohm–1 cm2 (g equivalent)–1
c) ohm cm2 (g equivalent)
d) S cm–2
Answer : B
Question : The resistance of 0.01 N solution of an electrolyte was found to be 220 ohm at 298 K using a onductivity cell with a cell constant of 0.88cm–1. The value of equivalent conductance of solution is –
a) 400 mho cm2 g eq–1
b) 295 mho cm2 g eq–1
c) 419 mho cm2 g eq–1
d) 425 mho cm2 g eq–1
Answer : A
Question : Specific conductance of 0.1 M HNO3 is 6.3×10–2 ohm–1 cm–1. The molar conductance of the solution is
a) 100 ohm–1 cm2
b) 515 ohm–1 cm2
c) 630 ohm–1 cm2
d) 6300 ohm–1 cm2
Answer : C
Question : The specific conductance of a 0.1 N KCl solution at 23°C is 0.012 ohm–1cm–1. The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be
a) 0.142 cm–1
b) 0.66 cm–1
c) 0.918 cm–1
d) 1.12 cm–1
Answer : B
Question : The unit of specific conductivity is
a) ohm cm–1
b) ohm cm–2
c) ohm–1 cm
d) ohm–1 cm–1
Answer : D
Question : Which of the following solutions of KCl will have the highest value of specific conductance?
a) 1.0 N
b) 0.1 N
c) 1.0 ×10–2N
d) 1.0 ×10–3N
Answer : A
Question : The cell constant of a conductivity cell ___________.
a) changes with change of electrolyte.
b) changes with change of concentration of electrolyte.
c) changes with temperature of electrolyte.
d) remains constant for a cell.
Answer : D
Question : The standard reduction potential at 298K for the following half cells are given:
Which is the strongest reducing agent?
a) Zn(s)
b) Cr(s)
c) Both
d) None of these
Answer : A
Question : Faraday’s laws of electrolysis are related to the
a) Atomic number of the cation
b) Atomic number of the anion
c) Equivalent weight of the electrolyte
d) Speed of the cation
Answer : C
Question : Which of the following statement is wrong about galvaniccell ?
a) cathode is positive charged
b) anode is negatively charged
c) reduction takes place at the anode
d) reduction takes place at the cathode
Answer : C
Question : In the electrolytic cell, flow of electrons if from
a) Cathode to anode in solution
b) Cathode to anode through external supply
c) Cathode to anode through internal supply
d) Anode to cathode through internal supply
Answer : C
Question : metal having negative reduction potential when dippedin the solution of its own ions, has a tendency :
a) to pass into the solution
b) to be deposited from the solution
c) to become electrically positive
d) to remain neutra
Answer : A
Question : A hydrogen electrode is immersed in a solution with pH = 0 (HCl). By how much will the potential (reduction) change if an equivalent amount of NaOH is added to the solution. (Take H2 p = 1 atm), T = 298 K.
a) increase by 0.41 V b) increase by 59 mV
c) decrease by 0.41 V d) decrease by 59 mV
Answer : A
Question : During the electrolysis of fused NaCl, the reaction thatoccurs at the anode is :
a) Chloride ions are oxidized
b) Chloride ions are reduced
c) Sodium ions are oxidized
d) Sodium ions are reduced
Answer : A
Question : In electroplating the article to be electroplated is made :
a) cathode
b) anode
c) either cathode or anode
d) simply suspended in the electrolytic bath.
Answer : A
Question : The electric charge for electrode deposition of one gram equivalent of a substance is
a) One ampere per second
b) 96.500 coulombs per second
c) One on one mole of electrons
d) Charge on one mole of electrons
Answer : D
Question : When a lead storage battery is discharged
a) SO2
b) Lead is formed
c) Lead sulphate is consumed
d) Sulphuric acid is consumed
Answer : D
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MCQs for Chapter 3 Electrochemistry Chemistry Class 12
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You can download the CBSE MCQs for Class 12 Chemistry Chapter 3 Electrochemistry for latest session from StudiesToday.com
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