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.
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?
107.How does molar conductance of a weak electrolyte vary with its concentration in solution?
The molar conductivity of a weak electrolyte like CH3COOH and NH3 etc. increases with decreases in concentration of the solute in solution. The increase is vary rapid at lower concentrations. The increases in the molar conductance with dilution is due to an increase in the effective degree of ionisation (α) at lower concentration and release of more free ions in the 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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