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Electrochemistry

Short Answer Type

71.

Given the standard electrode potentials:
K⁺/K = – 2.93 V Ag⁺/Ag = 0.80V
Hg²⁺/Hg = 0.79 V Mg²⁺/Mg = –2.37 V
Cr³⁺/Cr = –0.74 V.
Arrange these metals in their increasing order of reducing power.

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72. What is the efficiency of fuel cell? What is the use of fuel cell?

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73. Write the correct representation of cell:
2Cr(s) + 3Cd²⁺ (aq) → 2Cr³⁺ (aq) + 3Cd(s)

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74. What is the relationship between equivalent conductance and specific conductance?

Answer:

Λ_{E} = \frac{1000 \times K}{c} .

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75. What is the role of the salt bridge in a voltaic cell?

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76. What is the effect of dilution on equivalent conductance of solution?

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77. How is molar conductivity is related to molarity of electrolyte solutions?

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78. For the electrochemical reaction:
Zn²⁺(aq) + Cu(s) → Zn(s) + Cu²⁺(aq)
[E°_cell = – 1.10 V]
What does the negative value of E°_cell indicate?

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79. Why is not possible to determine for weak electrolytes by extrapolation?

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80. What is the use of platinum foil in the hydrogen electrode?

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