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Electro Chemistry

12th Chemistry - Electro Chemistry Model Question Paper

Electro Chemistry Model Question Paper

12th Standard

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Chemistry

Time : 00:45:00 Hrs
Total Marks : 35
    5 x 1 = 5

  1. The number of electrons that have a total charge of 9650 coulombs is_______.

    (a)

    6.22 ×1023

    (b)

    6.022 ×1024

    (c)

    6.022 ×1022

    (d)

    6.022 ×10−34

  2. The molar conductivity of a 0.5 mol dm-3 solution of AgNO3 with electrolytic conductivity of 5.76 ×10−3 S cm−1at 298 K is______.

    (a)

    2.88 S cm2mol-1

    (b)

    11.52 S cm2mol-1

    (c)

    0.086 S cm2mol-1

    (d)

    28.8 S cm2mol -1

  3. During electrolysis of molten sodium chloride, the time required to produce 0.1mole of chlorine gas using a current of 3A is _____.

    (a)

    55 minutes

    (b)

    107.2 minutes

    (c)

    220 minutes

    (d)

    330 minutes

  4. While charging lead storage battery _______.

    (a)

    PbSO4 on cathode is reduced to Pb

    (b)

    PbSO4 on anode is oxidised to PbO2

    (c)

    PbSO4 on anode is reduced to Pb

    (d)

    PbSO4 on cathode is oxidised to Pb

  5. In the electrochemical cell: Zn|ZnSO4 (0.01M)|| CuSO4 (1.0M)|Cu, the emf of this Daniel cell is E1. When the concentration of ZnSO4 is changed to 1.0M and that CuSO4 changed to 0.01M, the emf changes to E2. From the above, which one is the relationship between E1 and E2?

    (a)

    E1 < E2

    (b)

    E1 > E2

    (c)

    E2 ≥ E1

    (d)

    E1 = E2

    6. 3 x 2 = 6

  6. State Faraday’s Laws of electrolysis

  7. Describe the construction of Daniel cell. Write the cell reaction.

  8. Which of 0.1M HCl and 0.1 M KCl do you expect to have greater \(\stackrel{0}{\Lambda}_{\mathrm{m}}\)and why?

    9. 3 x 3 = 9

  9. 0.1M NaCl solution is placed in two different cells having cell constant 0.5 and 0.25 cm-1 respectively. Which of the two will have greater value of specific conductance.

  10. A current of 1.608A is passed through 250 mL of 0.5M solution of copper sulphate for 50 minutes. Calculate the strength of Cu2+ after electrolysis assuming volume to be constant and the current efficiency is 100%.

  11. Two metals M1 and M2 have reduction potential values of -xV and +yV respectively. Which will liberate H2 and H2SO4.

    12. 3 x 5 = 15

  12. Derive an expression for Nernst equation.

  13. Write a note on sacrificial protection.

  14. Ionic conductance at infinite dilution of Al3+ and SO4 2- are 189 and 160 mho cm2 equiv-1. Calculate the equivalent and molar conductance of the electrolyte Al2(SO4)3 at infinite dilution.

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