In the cell represented byPb(s)|Pb2+(1M) || Ag+(1M)| Ag(s), the r

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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


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


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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


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87.

In the cell represented by

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

  • Pb2+

  • Pb

  • Ag

  • Ag+


B.

Pb

Pb(s)|Pb2+(1M) || Ag+(1M)| Ag(s), the reducing agents is Pb  because it readily gets oxidised to Pb and helps in the reduction of Ag+ to Ag (s). 

               Pb(s) → Pb2+(1M) + 2e-

               Ag+ e- → Ag(s)

 


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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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