Chemistry : Electrochemistry

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Multiple Choice Questions

One coulomb is equal to
  • 96500 Faraday
  • 6.28 x 1018 electrons
  • 1 electron
  • None of these
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Answer
Charge required to liberate 11.5 g sodium is
  • 0.5 F
  • 0.1 F
  • 1.5 F
  • 96500 coulombs
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If a salt bridge is removed between the two half cells, the voltage
  • Drops to zero
  • Does not change
  • Increases gradually
  • Increases rapidly
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Answer
Normal hydrogen electrode has been assigned a potential of
  • one volt
  • zero volt
  • Hundred volts
  • 1000 volts
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Answer
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The charge required for the reduction of 1 mol of I2 to I– is:
  • 96500 C
  • 2 x 96500 C
  • 1/2 x 96500 C
  • 4 x 96500 C
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Answer
The electrolysis of dilute aqueous solution of Na2SO4 produces at anode and cathode respectively using Platinum electrodes
  • O2, H2
  • S2O82–, Na
  • O2, Na 
  •  S2O82–, H2
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Answer
All galvanic cells do not contains
  • a cathode 
  • an anode
  • ions
  • a porous plate
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Answer
Which of the following cell converts the heat released during the combustion of H2 to an electrical energy?
  • Mercury 
  • Leclanche cell
  • Fuel cell
  • Daniell cell
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Answer
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True Or False

State whether the following statements are true (T) or false (F):

A.

According Kohlrausch law the value of Λ°m of an electrolyte AB2 which dissociates as A2++ 2B– is given by λ°A+ + λB–

B.

The amount of electricity required to deposit 1 mol of aluminium from a solution of AlCl3 will be 3F.

C.

The molar conductivity of an electrolyte increases as concentration decreases.

D.

During the discharging of lead storage battery the density of H2SO4 decreases.

E.

Daniell cell converts the heat released during the combustion of H2 to an electrical energy.
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Answer

Multiple Choice Questions

The conductivity of molten NaCl is due to
  • free ions 
  • free electrons
  • free molecules
  • atoms of Na and CI
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Answer
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