CBSE Class 12 Chemistry Chapter 3 Electrochemistry MCQs
CBSE Class 12 Chemistry Chapter 3 Electrochemistry MCQs. These MCQ Question of Electrochemistry Chapter Class 12 are prepared by our Chemistry Expert. By practising following MCQs, students will be able to quickly revise all the concepts of the chapter.
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CBSE Class 12 Chemistry Chapter Electrochemistry MCQs (Set A)
1. Cell constant has the unit
(1) cm
(2) cm^–1
(3) cm^2
(4) cm sec^–1
Answer: cm^–1
2. Correct expression for conductance of an electrolyte whose cell constant is ‘a’ resistivity ‘X’ is
(1) 2 /Xa
(2) X
(3) a /X
(4) 1 /X a
Answer: X
3. Concentration C gram equiv./Litre has
a specific resistance R of a solution. The equivalent conductivity
of the solution is
(1) 1000/ RC
(2) C /R
(3) R /C
(4) 1000R /C
Answer: 1000/ RC
4. A solution is 0.3568
ohm^–1 cm^–1 have specific conductance. 0.0268 ohm^–1 is the conductance of the cell. The cell constant is
(1) 1.331 cm^–1
(2) 13.31 cm^–1
(3) 0.665 cm^–1
(4) 6.65 cm^–1
Answer: 13.31 cm^–1
5. Cell constant of an electrolytic solution is 0.5 cm–1 and resistivity 54 ohm-cm. Find conductance of the
electrolytic solution.
(1) 1/ 36
(2) 1/ 56
(3) 1/97
(4) 1/27
Answer: 1/27
6. 0.1 M nitric acid has a specific conductance is
6.3 × 10–2 ohm^–1 cm^–1. The molar conductance of
solution
(1) 630 ohm^–1 cm^2 mole^–1
(2) 315 ohm^–1 cm^2 mole^–1
(3) 100 ohm^–1 cm^2 mole^–1
(4) 6300 ohm^–1 cm^2 mole^–1
Answer: 630 ohm^–1 cm^2 mole^–1
7. Electrolyte solution has x as specific resistance
and y is the molarity of the solution, then ∆m is
given by _____.
(1) 1000x/ y
(2) 1000 y/ x
(3) 1000/ xy
(4) xy/ 1000
Answer: 1000/ xy
8. Ionic conductance at infinite dilution is given find increasing order?
(1) F^– < Cl^– < Br^– < I^–
(2) I^– < Br^– < F^– < Cl^–
(3) F^– < Cl^– < I^– < Br^–
(4) F^– < I^– < Cl^– < Br^–
Answer: F^– < Cl^– < I^– < Br^–
CBSE Class 12 Chemistry Chapter Electrochemistry MCQs (Set B)
1. Platinum electrodes of a conductivity cell has
1.2 cm^2 area separated by a distance of 0.8 cm. Cell constant is
(1) 0.76 cm^–1
(2) 1.5 cm^–1
(3) 0.96 cm^–1
(4) 0.66 cm^–1
Answer: 0.66 cm^–1
2. The factors which influence the conductance of
solution
(1) solute-solute interaction
(2) solute-solvent interaction
(3) temperature
(4) all of the above
Answer: all of the above
3. Device used to convert
chemical energy produced in ________ reaction into
__________ energy s called galvanic or voltaic cell.
(1) Chemical, chemical
(2) Electrical, chemical
(3) Redox, electrical
(4) Redox, redox
Answer: Electrical, chemical
4. In Daniell cell
(1) Zn rod as anode and Cu rod as cathode
(2) Zn rod is represented by (+ve) electrode
(3) Cu rod is represented by (–ve) electrode
(4) None
Answer: Zn rod as anode and Cu rod as cathode
5. In Galvanic cell, conventional,
(1) Anode is on the left hand side and is (+ve)
electrode
(2) Cathode is on the left hand side and is (+ve)
electrode
(3) Anode is on the left hand side and is (–ve)
electrode
(4) None
Answer: Anode is on the left hand side and is (–ve)
electrode
6. A potential develops between the electrode and electrolyte which is called as
(1) Electrode potential
(2) Zeta potential
(3) Cell potential
(4) No potential develops
Answer: Cell potential
7. In electrochemical cell, Zn | Zn+2 || Cu+2 | Cu.The species undergoing oxidation is
(1) Zn
(2) Zn+2
(3) Cu+2
(4) Cu
Answer: Zn+2
8. Electrolytes conducts electricity due to
(1) flow of ions
(2) flow of electrons
(3) both
(4) none
Answer: flow of ions
CBSE Class 12 Chemistry Chapter Electrochemistry MCQs (Set C)
1. Daniell cell is represented as
(1) Zn | Zn+2(aq) || Cu+2(aq) | Cu
(2) Cu | Cu+2(aq) || Zn+2(aq) | Zn
(3) Zn | Zn+2(aq) || Zn+2(aq) | Zn
(4) Cu | Cu+2(aq) || Cu+2(aq) | C
Answer: Zn | Zn+2(aq) || Cu+2(aq) | Cu
2. Equivalent conductivity of Fe2(SO4)3 is related to
molar conductivity by the expression
(1) ∆eq = ∆m
(2) ∆eq = ∆m/3
(3) ∆eq = 3∆m
(4) ∆eq = ∆m/6
Answer: ∆eq = ∆m/6
3. The molar conductivity and equivalent conductivity
are same for the solution of
(1) 1 M NaCl
(2) 1 M Ba (NO3)2
(3) 1 M Ca (NO3)2
(4) 1 M Th (NO3)4
Answer: 1 M NaCl
4. The variation of molar conductivity with
concentration of an electrolyte (X) in aqueous solution is shown in the given figure.
The electrolyte X is
(1) HCl
(2) NaCl
(3) KNO3
(4) CH3COOH
Answer: CH3COOH
5. The Kohlrausch’s law is related to
(1) Conductance of ions at infinite dilution.
(2) Independent migration of ions.
(3) Both (1) & (2)
(4) Neither (1) & (2)
Answer: Both (1) & (2)
6. The equilibrium constant of the reaction if Eo cell= 0.4 V Fe(s) + 2Ag+
(aq) → Fe+2 (aq) + 2Ag(s)at 298 K is
(1) 2.5 × 10^12
(2) 3.5 × 10^13
(3) 1.5 × 10^12
(4) 4.5 × 10^15
Answer: 4.5 × 10^15
7. Find the reduction potential of hydrogen electrode change when its solution initially at
pH = 7 is neutralized to pH = 0?
(1) increase by 0.059 V
(2) decrease by 0.059 V
(3) increase by 0.41 V
(4) decrease by 0.41 V
Answer: decrease by 0.41 V
8. The standard reduction potential values of three metallic cations X, Y and Z are 0.52, –3.03 and –1.18 V respectively. The order of reducing power of
the corresponding metal is
(1) Y > Z > X
(2) X > Y > Z
(3) Z > Y > X
(4) Z=Y=X
Answer: Y > Z > X
CBSE Class 12 Chemistry Chapter Electrochemistry MCQs (Set D)
1. For the following half cells , E° values
(i) A^3– → A^–2 + e; E° = 1.5 V
(ii) B^+ + e → B; E° = 0.5 V
(iii) C—2^+ + e → C+
; E° = 0.5 V
(iv) D → D2+ + 2e; E° =–1.15 V
Two half cells, combination would result in a cell with the largest potential?
(1) (i) and (iii)
(2) (i) and (iv)
(3) (ii) and (iv)
(4)(iii) and (iv)
Answer: (i) and (iv)
2. E°(Ni2+/Ni) = –0.25 volt E°(Au3+/Au) = 1.50 volt The emf of the voltaic cell.
Ni/Ni2+ (1.0 M) || Au3+ (1.0 M) | Au is:
(1) 1.25 volt
(2) –1.75 volt
(3) 1.75 volt
(4) 4.0 volt
Answer: 1.25 volt
3. The standard reduction potential at 25°C of Li+/Li,
Ba2+/Ba, Na+
/Na and Mg2+/Mg are –3.05, –2.73, –
2.71 and –2.37 volt respectively. Which one of the following is the strongest oxidizing agent?
(1) Na+
(2) Li+
(3) Ba2+
(4)Mg2+
Answer: Mg2+
4. The potential of single electrode depends upon
(1) The nature of the electrode
(2) Temperature
(3) Concentration of the ion with respect to
which it is reversible
(4) All of the above
Answer: Temperature
5. The oxidation potential of Hydrogen half-cell will
be negative if
(1) 2P(H )= 1 atm and[H+] = 1 M
(2) 2P(H )= 1 atm and[H+] = 2 M
(3) 2P(H )= 0.2 atm and [H+] = 1 M
(4) Both (2) and (3)
Answer: 2P(H )= 0.2 atm and [H+] = 1 M
6. The standard EMF of the cell reaction:
Zn + Cu^+2 —– Zn^+2 + Cu is 1.10 volt at 25°C.
The EMF for the cell reaction when 0.1 M Cu^+2 and
0.1 M Zn^+2 solutions are used at 25°C is
(1) 1.10 V
(2) 0.110 V
(3) –1.10 V
(4) –0.110 V
Answer: 1.10 V
7. 3.17 g., of a substance was deposited by the flow of
0.1 mole of electrons. The equivalent weight of the
substance is:
(1) 3.17
(2) .317
(3) 317
(4) 31.7
Answer: 31.7
8. After passing 2F charge, the molarity of CuSO4 will be if 1 litre of 1M CuSo4 Solution is electrolyzed:
(1) M/2
(2) M/4
(3) M
(4) zero
Answer: zero
CBSE Class 12 Chemistry Chapter Electrochemistry MCQs (Set E)
1. In solution of MgCl2 , Zn is added
(1) No reaction will take place
(2) ZnCl2 is formed
(3) Zinc dissolved in the solution
(4) Magnesium is precipitated
Answer: ZnCl2 is formed
2. Which of the following displacement does not
occur?
(1) Zn + 2H+ → Zn+2 + H2
(2) Fe + 2Ag+ → Fe+2 + 2Ag
(3) Cu + Fe+2 → Fe + Cu+2
(4) Zn + Pb+2 → Zn+2 + Pb
Answer: Fe + 2Ag+ → Fe+2 + 2Ag
3. The standard reduction potential of A, B and C are
0.34 V, 0.80 V and 0.79 V respectively. The
decreasing order of deposition of metals on
electrodes are
(1) A > B > C
(2) B > C > A
(3) C > B > A
(4) A > C > B
Answer: B > C > A
4. The products formed when an aqueous solution of NaBr is electrolyzed in a cell having in inert electrodes
are _________.
(1) Na and Br2
(2) Na and O2
(3) H2, Br2 and NaOH
(4) H2 and O2
Answer: Na and Br2
5. A standard reduction electrode potential of four
metals are
A = –0.250 V,
B = –0.140 V
C = –0.126 V
D = –0.402 V
The metal that displaces A and B from its compound
in aqueous solution is
(1) B
(2) C
(3) D
(4) None of the above
Answer: D
6. Using inert electrodes solution of sodium sulphate in water is electrolyzed. The product at the cathode and
anode are ___________ respectively
(1) H2, SO2
(2) O2, H2
(3) O2, Na
(4) H2, O2
Answer: H2, O2
7. If mercury is used as a cathode during electrolysis
of an NaCl aqueous solution, the ions discharged at
cathode are
(1) H+
(2) Na+
(3) OH–
(4) Cl
Answer: Na+
8. For the cell Zn | Zn2+ || Cu2+ | Cu, if the
concentration of both, Zn2+ and Cu2+ ions are
doubled, the EMF of the cell ___________.
(1) doubles
(2) reduces to half
(3) remains same
(4) becomes zero
Answer: remains same
CBSE Class 12 Chemistry Chapter Electrochemistry MCQs (Set F)
1. When two half-cells of electrode potential of E1 and E2 are combined to form a half cell of electrode potential E3, then (when n1, n2 and n3 are no. of electrons exchanged in first, second and combined half-cells) _________.
(1) E3 = E2 – E1
(2) E1=E2+E3
(3) E3 = E1 + E2
(4) none
Answer: E3 = E2 – E1
2. For a reaction – A(s) + 2B+ —-A
2^+ + 2B
KC has been found to be 1012. The E° cell is _______.
(1) 0.354 V
(2) 0.708 V
(3) 0.0098 V
(4) 1.36 V
Answer: 0.354 V
3. 0.1 M AgNO3 solution at 25°C . Find which of the following represents the potential of dipped silver wire?
(1) Ered °
(2) (Ered ° + 0.059)
(3) (Eox ° – 0.059)
(4) (Ered ° – 0.059)
Answer: (Ered ° + 0.059)
4. How much will the potential of Zn/Zn2+ change if the solution of Zn2+ is diluted 10 times?
(1) increase by 0.03 V
(2) decreases by 0.03V
(3) increases by 0.059 V
(4) decreases by 0.059V
Answer: increase by 0.03 V
5. Cu^+ + e– —– Cu, E° = x1 volt;
Cu^2+ + 2e– —- Cu, E° = x2 volt, then for
Cu^2+ + e– —- Cu+, E° (volt) will be:
(1) x1 – 2×2
(2) x1 + 2×2
(3) x1 – x2
(4) 2×1 – x1
Answer: 2×1 – x1
6. Pt | (H2)(1 atm) | pH = 1 || pH = 2 | (H2)(1 atm) | Pt
For the given cell , find the cell reaction is
(1) Spontaneous
(2) Non-spontaneous
(3) Equilibrium
(4) None of these
Answer: Non-spontaneous
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