Important Questions of Electrochemistry Chemistry | Zigya

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 Multiple Choice QuestionsMultiple Choice Questions

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401.

The potential of a hydrogen electrode at pH = 10 is 

  • 0.59 V

  • 0.00 V

  • -0.59 V

  • - 0.059 


 Multiple Choice QuestionsShort Answer Type

402.

A cell is represented by Zn|Zn2+ (aq) || Cu2+ (aq)| Cu. Given, Cu2+ + 2e- → Zn, E° = -0.763 V. Write the cell reactions, emf of the cell and state whether the cell reaction will be spontaneous or not?


 Multiple Choice QuestionsMultiple Choice Questions

403.

Cadmium rods are used for which purpese?

  • Emit electrons

  • Absorb neutrons

  • Emit neutrons

  • Absorb electrons


404.

What is the effect of dilution on the equivalent conductance of strong electrolyte?

  • Decrease on dilution

  • Remains unchanged

  • Increase on dilution

  • None of the above


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405.

In Down's method for the extraction of sodium, the melting point of the electrolyte is lowered by adding

  • potassium chloride

  • calcium chloride

  • both calcium chloride and potassium fluoride

  • potassium fluoride only


406.

 Calcium is obtained by

  • electrolysis of molten CaCl2

  • electrolysis of solution of CaCl2 in water

  • reduction of CaCl2 with carbon

  • roasting of lime stone


407.

A current of 12 ampere is passed through an electrolytic cell containing aqueous NiSO4 solution. Both Ni and H2 gas are formed at the cathode. The current efficiency is 60%. What is the mass of nickel deposited on the cathode per hour?

  • 7.883g

  • 3.941g

  • 5.91g

  • 2.645g


408.

The cell reaction of a cell is Mg(s) + Cu2+(aq)  Cu(s) + Mg2+(aq). If the standard reduction potentials of Mg and Cu are - 2.37 and + 0.34V respectively. The emf of the cell is

  • 2.03V

  • -2.03V

  • +2.71V

  • -2.71V


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409.

In the electrochemical reaction, 2Fe3++ Zn  Zn2++ 2Fe2+ increasing the concentration of Fe2+

  • increases cell emf

  • increases the current flow

  • decrease the cell emf

  • alter the pH of the solution


410.

Distribution law was given by :

  • Henry

  • vant Hoff

  • Nernst

  • Ostwald


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