Write Nernst equation for single electrode potential.

Answer:
for a single electrode potential 

EMn+/M = E°Mn+/M-2.303 RTnFlogMMn+.
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What will happen to the voltage if a salt bridge is removed between the half cells?

Answer:

The purpose of a salt bridge is not to move electrons from the electrolyte, rather to maintain charge balance because the electrons are moving from one half cell to the other. The electrons flow from the anode to the cathode thus if a salt bridge is removed between the half cells,  Voltage becomes zero.
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Why is the equilibrium constant K related to only         E°cell and not Ecell?

Answer:

It is because E
cell at equilibrium is 0 volt.
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What is the basis of obtaining electrical energy in fuel cells?

Answer:

Cells that are designed to convert the energy of combustion of fuels like hydrogen, methane, methanol, etc. directly into electrical energy are called fuel cells.

Combustion of fuels such as hydrogen, CO and CH4 is the basis of obtaining electrical energy in fuel cells.
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The standard reduction potential values of three metallic cation X, Y, Z are 0.52, – 3.03 and – 1.18 V respectively. What will be the order of reducing power of the corresponding metals ?


Answer:
The standard reduction potential is the tendency for a chemical species to be reduced, and is measured in volts at standard conditions. The more positive the potential is the more likely it will be reduced.

Y > Z > X.
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