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.
104.What happens during corrosion of a metal? State the electrochemical basis of corrosion of iron.
Metal reacts with gases present in atmosphere to form surface compounds in corrosion. The electrochemical basis of corrosion of iron is as follows: Iron in contact with the dissolved CO2 and O2 undergoes oxidation as follows: Fe → Fe2+ + 2e– E°oxidation = + 0.44 V The elctrons lost by iron are taken up by the H+ ions present on the surface of the metal which were produced by the dissociation of H2CO3 and H2O.
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105.
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?
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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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