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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?

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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?

Standard half-cell potential E° : If the ionic species have concentration of mol dm^–3and pressure of the gaseous species is 1 atm (101.325 KPa), than half-cell potential is called as standard half-cell potential. The temperature being 298 K.
Absolute value of half-cell potential cannot be determined experimentally. However, its value relative to reference electrode can be determined.
Reference electrode 11 given half-cell. E°_cell can be measured experimentally using a potentiometer.

Knowing the standard reduction potential of the reference electrode E°_half-cell can be found out.

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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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