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101. The standard reduction potential values of three metal cations Xa⁺, Yb⁺ and Zc⁺are + 0.52, – 3.03, – 1.18 V respectively. Arrange the corresponding metals, in the order of their increasing reducing power.

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102. Explain with the help of a diagram the effect of change in concentration of solution on the molar conductance of (i) a weak electrolyte, (ii) a strong electrolyte.

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103. State two advantages of H₂O fuel cell over ordinary cell.

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104. What happens during corrosion of a metal? State the electrochemical basis of corrosion of iron.

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105.

{E^{0}}_{{Ni}^{2 +} / Ni} and {E^{0}}_{{Cu}^{2 +} / Cu}

are -0.25 V and + 0.34 respectively at 298 K. Formulate the self operating galvanic cell for this electrode pair. What reaction takes place in its operation? How is the ΔG° for this reaction related to the cell e.m.f.?

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106. How does molar conductance of a strong electrolyte vary with its concentration in solution?

The molar conductivity of a strong electrolyte like KCl decreases slightly as the concentration is increased. This is because greater inter ionic attractions retard the motion of the ions and therefore molar conductivity decreases.
At low concentrations, the molar conductance of strong electrolyte can be expressed by the relationship.

where
Λ_m = molar conductance at concentration C.
Λ_m = molar conductance at infinite dilution. K = constant
C = concentration of solution on molar scale.

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107. How does molar conductance of a weak electrolyte vary with its concentration in solution?

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Long Answer Type

108. What do you understand by standard potential of a half-cell? How is the electrode potential of a half-cell determined?

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Short Answer Type

109. Define molar conductivity of an electrolytic solution. Mention the effect of temperature on molar conductivity.

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110. Write anode and cathode reactions from electrolysis of water. How much charge will be transported for the decomposition of 3.6 g of H₂O? [F = 96500 C mol^–1]

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