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Electrochemistry

Short Answer Type

81. Why does a mercury cell give a constant voltage throughout its life?

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82. Rusting of iron is quicker in saline water than in ordinary water. Why?

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83. When a solution containing zinc ions and silver ions is electrolysed, silver is deposited at cathode. Why?

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84. What value for standard emf of normal hydrogen electrode has been assigned?

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85. What is the charge on 1 mole of electrons?

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86. Write Nernst equation for single electrode potential.

Answer:
for a single electrode potential

E_{M^{n +} / M} = E °_{M^{n +} / M} - \frac{2.303 RT}{nF} \log \frac{[M]}{[M^{n +}]} .

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87. Why is the equilibrium constant K related to only E°_cell and not E_cell?

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88. What is the basis of obtaining electrical energy in fuel cells?

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89. What will happen to the voltage if a salt bridge is removed between the half cells?

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90. 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 ?

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