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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?

Answer:

The discharge (reduction) potential of silver is less than that of zinc.
This is because these metals are less reactive than hydrogen and are lower down in the reactivity series. Reactive ions stay in solution and do not form atoms because they are more stable than the atoms.

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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?

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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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