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Electrochemistry

Long Answer Type

121. Define the terms equivalent and molar conductivity. What are their physical signific-ance?

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Short Answer Type

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?

212 Views

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.)

Corrosion slowly coats the surfaces of metallic objects with oxides or other salts of the metal. The rusting of iron, tarnishing of silver, development of green coating on copper and bronze are some of the
examples of corrosion.

presence of CO₂ are factors which affect corrosion, CO₂increases rusting of iron.
Carbon dioxide reacts with water:
CO₂ + H₂O --> HCO₃^- + H⁺
As the concentration of CO2 increases, so does the concentration of the H⁺ ion. This ion then react with Fe in metals: Fe + 2H⁺ --> 2H (atom) + Fe²⁺ As corrosion proceeds, the ferrous ions produced react with the bicarbonate ions to form ferrous carbonate which precipitated as a scale

135 Views

124. What is a salt bridge? What is its significance?

186 Views

Long Answer Type

125.

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

294 Views

126. Explain why electrolysis of aqueous solution of NaCl gives H₂ at cathode and Cl₂ at anode. Write overall reaction.

3952 Views

Short Answer Type

127.

The following curve is obtained when molar conductivity λ_m (y-axis) is plotted against the square root of concentration C^1/2 (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 λ_m for the electrolytes A and B on dilution.

419 Views

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?

135 Views