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MCQs - Electrochemistry - 01

Dr. Vikas Yadav

October 27, 2021 at 4:03:25 PM


Quiz - 01
1. Electrolysis involves oxidation and reduction respectively at:
(a) Anode and cathode
(b) Cathode and anode
(c) At both the electrode
(d) None of these

2. All galvanic cell do not contain:
(a) A cathode
(b) An anode
(c) Ions
(d) A porous plate

3. The unit of equivalent conductance is:
(a) ohm–1 cm2 equiv–1
(b) ohm–1 cm2 gm–1
(c) ohm cm2 equiv–1
(d) ohm–1 mole–1

4. Conductivity of a solution is directly proportional to:
(a) Dilution
(b) Number of ions
(c) Current density
(d) Volume of the solution

5. A current liberates 0·50 g of hydrogen in 2 hours. The weight of copper (at. wt. = 63·5) deposited at the same time by the same current through copper sulphate solution is:
(a) 63·5 g
(b) 31·8 g
(c) 15·9 g
(d) 15·5 g

6. Electrochemical equivalent is the amount of substance which gets deposited from its solution on passing electrical charge equal to:
(a) 96,500 coulomb
(b) 1 coulomb
(c) 60 coulomb
(d) 965 coulomb

7. Which of the following cells can convert chemical energy of H2 and O2 directly into electrical energy?
(a) Mercury cell
(b) Daniel cell
(c) Fuel cell
(d) Lead storage cell

8. When lead storage battery discharges?
(a) SO2 is evolved
(b) PbSO4 is consumed
(c) Lead is formed
(d) Sulphuric acid is consumed

9. When zinc granule is dipped into copper sulphate solution, copper is precipitated because:
(a) Both, copper and zinc have a positive reduction potential
(b) Reduction potential of copper is higher than that of zinc
(c) Reduction potential of zinc is higher than that of copper
(d) Both, zinc and copper have a negative reduction potential

10. The reaction is spontaneous if the cell potential is:
(a) Positive
(b) Negative
(c) Zero
(d) Infinite

11. The quantity of electricity required to deposit 1·15 g of sodium from molten NaCl (Na = 23, Cl = 35·5) is:
(a) 1 F
(b) 0·5 F
(c) 0.05 F
(d) 1·5 F

12. Saturated solution of KNO3 is used to make salt bridge because:
(a) Velocity of K+ is greater than that of NO3 –
(b) Velocity of NO3 – is greater than that of K+
(c) Velocity of both K+ and NO3– are nearly the same
(d) KNO3 is highly soluble in water

13. The number of Faradays required to reduce one mol of Cu2+ to metallic copper is:
(a) One
(b) Two
(c) Three
(d) Four

14. 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

15. When heating one end of a metal plate, the other end gets hot because of
(a) The resistance of the metal
(b) Mobility of atoms in the metal
(c) Energised electrons moving to the other end
(d) Minor perturbation in the energy of atoms.

16. The weight of silver displaced by a quantity of electricity which displaces 5600ml of O2 at STP will be:
(a) 5.4g
(b) 10.8g
(c) 54.9g
(d) 108.0g

17. Which of the following statements regarding fuel cells is false?
(a) Because of continuous supply, fuel cells never become dead
(b) They do not cause pollution
(c) Fuel cells have 100% efficiency practically
(d) The cost of catalysts needed for the electrode reactions is high

18. The standard electrode potentials of four elements A, B, C and D are – 3·05, 1·66, – 0·40 and 0.80 volts respectively. The highest chemical activity will be shown by:
(a) A
(b) B
(c) C
(d) D

19. Galvanised iron sheets are coated with:
(a) Carbon
(b) Copper
(c) Zinc
(d) Nickel

20. Which of the following element act as inert electrode
(a) Cu
(b) Ag
(c) Pt
(d) None

Answers –
1. A
2. D
3. A
4. B
5. C
6. A
7. C
8. D
9. B
10. A
11. C
12. C
13. B
14. B
15. C
16. D
17. C
18. A
19. C
20. C

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