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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.

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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?

Answer:

Cells that are designed to convert the energy of combustion of fuels like hydrogen, methane, methanol, etc. directly into electrical energy are called fuel cells.

Combustion of fuels such as hydrogen, CO and CH₄ 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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