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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?

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

Answer:

The purpose of a salt bridge is not to move electrons from the electrolyte, rather to maintain charge balance because the electrons are moving from one half cell to the other. The electrons flow from the anode to the cathode thus if a salt bridge is removed between the half cells, Voltage becomes zero.

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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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