Quiz  /  Electrochemistry Class 12 MCQ Questions With Answers

  • 1. 
    According to Bronsted law, water is a/an

  • acid
  • base
  • both acid and base
  • none of the above

  • 2. 
    The oxidation number of chlorine in HClO4

  • +5
  • +6
  • +7
  • +8

  • 3. 
    According to Bronsted-Lowry concept, base is a substance which is

  • proton acceptor
  • electron pair acceptor
  • proton donor
  • electron pair donor

  • 4. 
    Lewis base among the following

  • NH3
  • H2O
  • CN
  • all the above

  • 5. 
    In coordination compounds , the ligands act as

  • lewis acid
  • lewis base
  • arrhenius acid
  • arrhenius base

  • 6. 
    BF3 acts as an acid according to

  • arrhenius theory
  • lowery bronsted
  • lewis
  • all the above

  • 7. 
    What is a reducing agent?

  • It is the species that gets reduced -- gains electrons.
  • It is the species that gets oxidized -- loses electrons.
  • It is the species that creates electrons.
  • It is the species that destroys electrons.

  • 8. 
    Which energy conversion shown below takes place in an electrochemical cell?

  • Electrical to chemical
  • Mechanical to chemical
  • Mechanical to electrical
  • Chemical to electrical

  • 9. 
    An iron nail is put into a solution of copper nitrate, iron is above copper in the activity series of metals, what will happen?

  • iron will be reduced
  • bubbles of oxygen gas will form on iron nail
  • the iron nail will become copper plated
  • no reaction occurs

  • 10. 
    What is an oxidizing agent?

  • It is the species that gets reduced -- gains electrons.
  • It is the species that gets oxidized -- loses electrons.
  • It is the species that creates electrons.
  • It is the species that loses electrons.

  • 11. 
    Given their standard reduction potentials, which of the species is going to be oxidized? Cu2+/Cu = 0.34VZn2+/Zn = -0.76V

  • Cu
  • Zn
  • CuSO4
  • ZnSO4

  • 12. 
    What is a standard half-cell?

  • It is one cell that comprises half of a whole battery.
  • It is a cell containing only a metal bar with no aqueous ion solution.
  • It is a cell containing only an aqueous ion solution and no metal bar.
  • It is a cell that generates half of a volt of electricity.

  • 13. 
    Electrons are gained at the

  • anode
  • cathode

  • 14. 
    Which metal is the negative electrode?Zn/Zn2+ // Cu2+/Cu

  • zinc
  • copper

  • 15. 
    Ecell =

  • Ered - Eox
  • Ered + Eox
  • Eox - Ered
  • Eox + Ered

  • 16. 
    What reaction occurs at the anode?Ag+/Ag = 0.80VNi2+/Ni = -0.25V

  • Ag+ + e- →Ag
  • Ag → Ag+ + e-
  • Ni2+ + 2e- → Ni
  • Ni → Ni2+ + 2e-

  • 17. 
    Which are examples of reduction?

  • I and II
  • I and III
  • II and III
  • I, II and III

  • 18. 
    Consider the galvanic cell given.Which of the following deductions about this cell is correct?

  • Oxidation is occurring in half-cell 2
  • The positive electrode is in half-cell 2
  • Oxidation is occurring in half-cell 1
  • The negative electrode is in half-cell 1

  • 19. 
    Calculate the standard cell potential.3Mg + 2Al3+ --> 2Al + 3Mg2+

  • +0.71 V
  • -0.71 V

  • 20. 
    ANOTHER NAME FOR A SPONTANEOUS ELECTROCHEMICAL CELL

  • SALT BRIDGE
  • VOLTMETER
  • ELECTROLYSIS CELL
  • VOLTAIC CELL

  • 21. 
    In a Galvanic Cell, the anode is...

  • positive
  • negative

  • 22. 
    What is reduction?

  • It is the gain of electrons.
  • It is the loss of electrons.
  • It is the creation of electrons.
  • It is the destruction of electrons.

  • 23. 
    If an electrochemical reaction is spontaneous, what will Ecell be?

  • positive
  • negative

  • 24. 
    What is an anode?

  • It is the electrode where oxidation takes place.
  • It is the electrode where reduction takes place.
  • It is an aqueous solution containing an electrode.
  • It is the salt bridge that connects half-cells.

  • 25. 
    What occurs to the mass of copper electrode in the following reaction?Zn/Zn2+ // Cu2+/Cu

  • increases
  • decreases
  • remains the same

  • 26. 
    What is a cathode?

  • It is the electrode where oxidation takes place.
  • It is the electrode where reduction takes place.
  • It is an aqueous solution containing an electrode.
  • It is the salt bridge that connects half-cells.
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