Electrochemistry
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10 QuestionsShow answers
  • Question 1
    120 seconds
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    Q.

    The standard electrode potentials for three half-cells are given below.

    X2+ / X ; Eө = – 0.44 V

    Y2+ / Y ; Eө = – 0.76 V

    Z2+ / Z ; Eө = +0.34 V

    Which of the following can reduce Sn2+ (aq) to Sn (s) at 298K?

    (The standard electrode potential for Sn2+ (aq) / Sn (s) at 298 K is 0.14 V)

    answer choices

    X and Y only

    X, Y and Z

    X2+ and Y2+only

    Y2+ and Z only

  • Question 2
    120 seconds
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    Q.

    What is the standard e.m.f. of the cell shown in the following diagram?

    (Standard electrode potentials: Fe2+ / Fe,– 0.44V; Fe3+ / Fe,– 0.04V; Fe3+ / Fe2+ ,+ 0.77V; Pb2+ / Pb,– 0.13V)

    answer choices

    1.67V

    0.90V

    0.64V

    0.31V

  • Question 3
    120 seconds
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    Q.

    The standard electrode potentials for some half-cell reactions are given below

    Half-cell reaction Eө / V

    ½ Br2 + e --> Br+ 1.07

    Fe3+ + e --> Fe2+ + 0.77

    ½ I2 + e --> I+ 0.54

    Which pairs of species can react with each other based on the above data?

    answer choices

    I and Fe3+

    Br2 and Fe2+

    I2 and Br

  • Question 4
    120 seconds
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    Q.

    The standard reduction electrode potential for several half-reactions at 298K are shown.


    Based on the above data, which of the following statements is correct?

    answer choices

    Fe2+ is the strongest oxidizing agent.

    H2O2 can spontaneously oxidise Fe2+ ions.

    The highest e.m.f. is obtained for cells I and III.

    Both Fe3+ and Sn2+ ions can react with Mn2+.

  • Question 5
    120 seconds
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    Q.

    After a steady current of 18.0 A was passed for 20.0 minutes through a solution of copper(II) sulphate, the mass of the impure copper anode decreased by 8.01 g. What is the percentage purity of copper in the impure copper rod? [Ar Cu = 63.5 ; Faraday’s constant = 96500 C mol-1]

    answer choices

    73.5%

    79.6%

    81.2%

    88.7%

  • Question 6
    120 seconds
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    Q.

    Which of the following is true about the Danielle cell?

    answer choices

    The e.m.f is 1.5V

    The cathode is negatively charged.

    Electricity flows from the zinc electrode to the copper electrode

    outside the cell.

    The electron flows from anode to cathode outside the cell.

  • Question 7
    120 seconds
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    Q.

    Mg2+ + 2e --> Mg; E = - 2.38V

    Fe3+ + e --> Fe2+; E = +0.77V


    Calculate the e.m.f. of the following cell:

    Mg l Mg2+ (10M) ll Fe3+ (5M) l Fe2+(1m) l Pt

    answer choices

    - 0.86V

    – 2.31V

    + 3.16V

    + 4.17v

  • Question 8
    120 seconds
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    Q.

    During electrolysis of a copper(II) salt solution between copper electrodes, the mass of copper electroplated on the cathode depends on

    answer choices

    The electric current

    The time taken

    The characteristics of anions present

  • Question 9
    120 seconds
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    Q.

    In which of the following pairs of spesies is the sulphur in the same oxidation state in both members of the pairs?

    answer choices

    SF6 and SO42-

    SO2 and HSO3-

    S2O32- and S4O62-

  • Question 10
    30 seconds
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    Q.

    The e.m.f. of the cell Pt(s) |H2(g)|H+(aq)||Ag+(aq)|Ag(s) would be increased by

    answer choices

    increasing the concentration of H+(aq).

    increasing the surface area of the Pt electrode.

    increasing the concentration of Ag+(aq).

    decreasing the pressure of H2(g).

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