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 Multiple Choice QuestionsLong Answer Type

121. Define the terms equivalent and molar conductivity. What are their physical signific-ance?
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 Multiple Choice QuestionsShort Answer Type

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122. How is molar conductivity related to concentration of an electrolyte? How will you explain a weak and a strong electrolyte based on their conductivity values?


conductivity and molar conductivity change with the concentration of the electrolyte. Conductivity always decreases with decrease in concentration both, for weak and strong electrolytes.


Molar conductivity varies with the concentration of electolytes.

Λm = Λm-bC
Here b = Experimental constant
Λm = Molar conductivity at infinite solution.
The plot of Λ
m versus C would give a straight line.

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123. What is corrosion? What are the factors which effect corrosions? CO2 is always present in natural water. Explain its affect (increases, stops or no effect > on rusting of Fe.)
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124. What is a salt bridge? What is its significance?
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 Multiple Choice QuestionsLong Answer Type

125.

What is corrosion? Describe the electrochemical phenomenon of rusting of iron.

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126. Explain why electrolysis of aqueous solution of NaCl gives H2 at cathode and Cl2 at anode. Write overall reaction.
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 Multiple Choice QuestionsShort Answer Type

127.

The following curve is obtained when molar conductivity λm (y-axis) is plotted against the square root of concentration C1/2 (x-axis) for two electrolytes A and B.
(a) What can you about the nature of the two electrolytes A and B.
(b) How do you account for the increase in molar conductivity λm for the electrolytes A and B on dilution.


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128. How is the standard free energy change related to
(i) emf of a galvanic cell related to the reaction.
(ii) equilibrium constant of the reaction in equilibrium state?
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129. Prove that the free energy (ΔG) and the emf of an electro-chemical cell are related by
ΔG = – nFE0.
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 Multiple Choice QuestionsLong Answer Type

130. What are fuel cells? Write reaction of a oxygen-hydrogen fuel cell. Write two advantages of the use of a hydrogen-oxygen fuel cell.
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