The oxidation potential values of A, B, C and D are -0.03 V, +0.1

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 Multiple Choice QuestionsMultiple Choice Questions

111.

What is potential of platinum wire dipped into a solution of 0.1 M in Sn2+ and 0.01 M in Sn4+ ?

  • E° + 0.059

  • E° + 0.0592

  • E° - 0.059


112.

Zn(s) | Zn2+(aq)|| Cu2+(aq) | Cu(s) is :

(anode)                        (cathode)

  • Weston cell

  • Daniel cell

  • Faraday cell

  • Standard cell


113.

Copper sulphate solution does not react with

  • Zinc

  • Iron

  • Silver

  • All of these


114.

When 1 F of electricity is passed through acidulated water, O2 evolved is

  • 11.2 dm3

  • 5.6 dm3

  • 22.4 dm3

  • 1.0 dm3


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115.

Standard electrode potential of cell H2 | H+||Ag+| Ag is

  • 0.8 V

  • -0.8 V

  • -1.2 V

  • 1.2 V


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116.

The oxidation potential values of A, B, C and D are -0.03 V, +0.108 V, -0.07 V and +0.1 V respectively. The non-spontaneous cell reaction takes place between

  • A and B

  • Band D

  • D and A

  • B and C


A.

A and B

The electrode with higher oxidation potential acts as anode and electrode with lower oxidation potential acts as cathode. Cell reaction is spontaneous when Ecell is positive (Ecell = EC - EA).

For A and B, oxidation potential is -0.03 and +0.108 respectively. Since, oxidation potential of B is more than A, oxidation of A is not possible. Therefore, cell having A as anode and B as cathode is not possible.

Therefore, non-spontaneous cell reaction takes place between A and D.


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117.

Na is used in reduction of Zn salt because

  • Zn (oxi) > E°Na (oxi)

  • Zn (red) > E°Na (red)

  • Zn (oxi) < E°Na (oxi)

  • both (a) and (b)


118.

Reduction potentials of A, B, C and D are 0.8 V, 0.79 V, 0.34 V and -2.37 V respectively. Which element displaces all the other three elements?

  • B

  • A

  • D

  • C


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119.

During the electrolytic reduction of alumina, the reaction at cathode is

  • 2H2O → O2 + 4H+ + 4e-

  • 3F- → 3F + 3e-

  • Al3+ + 3e- → Al

  • 2H+ + 2e- → H2


120.

One ampere of current is passed for 9650 seconds through molten AlCl3. What is the weight in grams of Al deposited at cathode? (atomic weight of Al = 27)

  • 0.9

  • 9.0

  • 0.09

  • 90.0


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