The standard reduction potential values of the three metallic cations, X, Y, Z are 0.52, – 3.03 and - 1.18 V respectively. The order of reducing power of the correspor ding metals is
  • Y > Z > X
  • X > Y > Z
  • Z > Y > X
  • Z > X > Y

A.

Y > Z > X
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What is thermodynamic efficiency of a cell?


Answer:

 

The fuel cell thermodynamic efficiency is given by the ratio of the Gibbs function change to the Enthalpy change in the overall cell reaction. The Gibbs function change measures the electrical work and the enthalpy change is a measure of the heating value of the fuel. 
Efficiency = (dG/dH)

Thermodynamic efficiency,
η = GH=-nEFH
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Name the electrolyte used in fuel cell?

Answer:

Aqueous NaOH or aqueous KOH.
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Can we use copper vessel to store AgNOsolution ?

Answer:

No because copper is more reactive than silver thus it replace silver and formed product.
The reaction

Cu + 2AgNO3 → Cu(NO3)2 + 2Ag will occur.
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All galvanic cells do not contains
  • a cathode 
  • an anode
  • ions
  • a porous plate

D.

a porous plate
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