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Electro Chemistry 5 Mark Creative Question Paper With Answer Key

12th Standard

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Chemistry

Time : 02:30:00 Hrs
Total Marks : 75

    5 Marks 

    15 x 5 = 75
  1. What is the electrochemical equivalent of a substance when 150 gm of it is deposited by 10 ampere of current passed for 1 sec?

  2. The electrochemical equivalent of an electrolyte is 2.35 gm amp-1 sec-1. Calculate I the amount of the substance deposited when 5 ampere is passed for 10 sec.

  3. To 1M solution of AgNO3, 0.75 F quantity of current is passed. What is the concentration of the electrolyte, AgNO3 remaining in the solution?

  4. 0.5 F of electric current was passed through 5 molar solution of AgNO3, CuSO4 and AICl3 connected in series. Find out the concentration of each of the electrolyte after the electrolysis.

  5. To one molar solution of a trivalent metal salt, electrolysis was carried out and 0.667 M was the concentration remaining after electrolysis. Calculate the quantity of electricity passed.

  6. A conductance cell has platinum electrodes, each with 5 cm2 area and separated by 0.5 cm distance. What is the cell constant?

  7. Specific conductance of 1M KNO3 solution is oberved to be 5.55 x 10-3 mho cm2. What is the equivalent conductance of KNO3 when one litre of the solution is used?

  8. The equivalent conductances at infinite dilution of HCl, CH3COONa and NaCl are 42616, 91.0 and 126.45 ohm-1 cm2 gm equuivalent-1 respectively. Calculate the equivalent conductance (λ) of acetic acid.

  9. The standard reduction potential for the reaction Sn4+ + 2e- ⟶ Sn2+ is + 0.15v. Calcuate the free energy change of the reaction.

  10. Write the Nernst equation for the half cell Zn2+(aq)/ Zn(s)

  11. The emf of the cell Cd/CdCl2, 25H2O / AgCI(s) Ag Eo is 0.675 V. Calculate of the cell reaction.

  12. The standard free energy change of the reaction M+(aq)+ e- ⟶ M(s) is -23.125 kJ. Calculate the standard emf of the half cell.

  13. The emf of the half cell Cu2+(aq)/ Cu(s). containing 0.01 M Cu2+solution is + 0.301V. Calculate the standard emf of the half cell

  14. If E1 = 0.5 V corresponds to Cr3++ 3e- ➝ Cr(s) and E= 0.41V corresponds to Cr3++ e- ➝ Cr2+ reactions, calculate the emf (E3) of the reaction Cr2++ 2 e- ➝ Cr(s)

  15. Calculate the standard emf of the cell having the standard free energy change of the cell reaction is -64.84 kJ for 2 electrons transfer.

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