The overall reaction taking place at anode during electrolysis of

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 Multiple Choice QuestionsMultiple Choice Questions

81.

According to Faraday's first law

  • w =  96500 × EI × t

  • w =  I × t × E96500

  • E=I × t × 96500w

  • E =  I × wt × 96500


82.

The standard reduction potential for Fe2+/Fe and Sn2+/Sn electrodes are - 0.44 and- 0.14 V respectively. For the cell reaction,  Fe+ + Sn  Fe + Sn2+  the standard emf is

  • + 0.30 V

  • - 0.58 V

  • + 0.58 V

  • - 0.30 V


83.

How is electrical conductance of a conductor related with length and area of cross section of the conductor?

  • G = κ· l· a-1

  • G = l· a· κ-1

  • G = κ· a· l-1

  • G = κ· a· l-2


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84.

The overall reaction taking place at anode during electrolysis of fused sodium chloride using suitable electrode is

  • oxidation of chloride

  • reduction of sodium ions

  • reduction of chlorine

  • oxidation of sodium atoms


D.

oxidation of sodium atoms

During the electrolysis of fused NaCl, oxidation of sodium atoms takes place at anode and reduction of chlorine at cathode. The reaction looks like-

Hence, oxidation takes place at anode.


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85.

Which among the following solutions is not used in determination of the cell constant?

  • 10-2 M KCl

  • 10-1 M KCl

  • 1 M KCl

  • Saturated KCl


86.

How many Faradays of electricity are required to deposit 10g of calcium from molten calcium chloride using inert electrodes? ( Molar mass of calcium = 40g mol-1)

  • 0.5 F

  • 1F

  • 0.25 F

  • 2 F


87.

In the cell represented by

Pb(s)|Pb2+(1M) || Ag+(1M)| Ag(s), the reducing agents is

  • Pb2+

  • Pb

  • Ag

  • Ag+


88.

What is the SI unit of conductivity?

  • Sm

  • Sm-1

  • Sm2

  • Sm-2


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89.

Consider the equilibrium obtained by electrically connecting zinc-amalgam Zn(Hg) and HgO electrodes in mercury cell,

Au(Hg) + HgO (s)  ZnO (s) + Hg (l)

Under this equilibrium, what is the relation between the potential of the Zn(Hg) and HgO electrodes measured against the standard hydrogen electrode?

  • Zn(Hg) electrode potential is equal to HgO electrode potential.

  • Zn(Hg) electrode potential is more than HgO electrode potential.

  • HgO electrode potential is more than Zn(Hg) electrode.

  • Cell voltage at above said equilibrium is 1.35 V


90.

The standard reduction potential for Zn2+ /Zn, Ni2+ /Ni and Fe2+ /Fe are respectively -0.76, -0.23 and -0.44 V. The reaction X + Y2+ → X2+ + Y will have more negative G value when X and Y are

  • X = Ni; Y = Fe

  • X = Ni; Y = Zn

  • X = Fe; Y = Zn

  • X = Zn; Y = Ni


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