Assignment – 2
Electrochemistry
MCQS

1. Which of the following statement is correct?
(i) ECell and ∆rG of cell reaction both are extensive properties.
(ii) ECell and ∆rG of cell reaction both are intensive properties.
(iii) ECell is an intensive property while ∆rG of cell reaction is an extensive property.
(iv) ECell is an extensive property while ∆rG of cell reaction is an intensive property.

2. The difference between the electrode potentials of two electrodes when no current is drawn through the cell is called ___________.
(i) Cell potential                                               (ii) Cell emf
(iii) Potential difference                                    (iv) Cell voltage

3. Which of the following statement is not correct about an inert electrode in a cell?
(i) It does not participate in the cell reaction.
(ii) It provides surface either for oxidation or for reduction reaction.
(iii) It provides surface for conduction of electrons.
(iv) It provides surface for redox reaction.

4. An electrochemical cell can behave like an electrolytic cell when ____________.
(i) Ecell = 0                                                        (ii) Ecell > Eext
(iii) Eext > Ecell                                                            (iv) Ecell = Eext

5. Which of the statements about solutions of electrolytes is not correct?
(i) Conductivity of solution depends upon size of ions.
(ii) Conductivity depends upon viscosity of solution.
(iii) Conductivity does not depend upon solvation of ions present in solution.
(iv) Conductivity of solution increases with temperature.

6. The quantity of charge required to obtain one mole of aluminium from Al2O3 is ___________.
(i) 1F                      (ii) 6F                      (iii) 3F                     (iv) 2F

7. The cell constant of a conductivity cell _____________.
(i) Changes with change of electrolyte.
(ii) Changes with change of concentration of electrolyte.
(iii) Changes with temperature of electrolyte.
(iv) Remains constant for a cell.

8. While charging the lead storage battery ______________.
(i) PbSO4 anode is reduced to Pb.                    (ii) PbSO4 cathode is reduced to Pb.
(iii) PbSO4 cathode is oxidised to Pb.                (iv) PbSO4 anode is oxidised to PbO2.

9. The positive value of the standard electrode potential of Cu2+/Cu indicates that ____________.
(i) This redox couple is a stronger reducing agent than the H+/H2 couple.
(ii) This redox couple is a stronger oxidising agent than H+/H2.
(iii) Cu can displace H2 from acid.
(iv) Cu cannot displace H2 from acid.

10. Conductivity of an electrolytic solution depends on ____________.
(i) Nature of electrolyte.                                    (ii) Concentration of electrolyte.
(iii) Power of AC source.                                  (iv) Distance between the electrodes.

11. What will happen during the electrolysis of aqueous solution of CuSO4 by using platinum electrodes?
(i) Copper will deposit at cathode.                     (ii) Copper will deposit at anode.
(iii) Oxygen will be released at anode.              (iv) Copper will dissolve at anode.

12. What will happen during the electrolysis of aqueous solution of CuSO4 in the presence of Cu electrodes?
(i) Copper will deposit at cathode.                     (ii) Copper will dissolve at anode.
(iii) Oxygen will be released at anode.              (iv) Copper will deposit at anode.

13. Molar conductivity of ionic solution depends on ___________.
(i) Temperature.                                                  (ii) Distance between electrodes.
(iii) Concentration of electrolytes in solution.      (iv) Surface area of electrodes.

14. For the given cell, Mg|Mg2+|| Cu2+|Cu
(i) Mg is cathode                                                      (ii) Cu is cathode
(iii) The cell reaction is Mg + Cu2+ → Mg2+ + Cu    (iv) Cu is the oxidising agent

15. Can absolute electrode potential of an electrode be measured?

16. Under what condition is E0Cell = 0 or ∆rG = 0?