Class 12 Chemistry
Chapter 3 – Electrochemistry
Magical Series Assignment 5
Q.1. Express the relation among the conductivity of solution in the cell, the cell constant and the resistance of solution in the cell.
Q.2. State Kohlrausch's law of independent migration of ions. Write its one application.
Q.3. Define Molar conductivity (Lm).
Q.4. Express the relation between conductivity and molar conductivity of a solution in a cell?
Q.5. Give reason: Conductivity of CH3COOH decreases on dilution.
Q.6. Define limiting molar conductivity. Why conductivity of an electrolyte solution decreases with the decrease in concentration?
Q.7.
Calculate the degree of dissociation (α) of acetic acid if its molar conductivity (Lm) is 39.05 S cm2 mol–1.
(Given: λo(H+) = 349.68 S cm2 mol–1
and λo(CH3COO–) = 40.9 S cm2
mol–1)
[Ans: 0.1]
Q.8. Define the term degree of dissociation. Write an expression that relates the molar conductivity of a weak electrolyte to its degree of dissociation.
Q.9. Define conductivity and molar conductivity for the solution of an electrolyte. Discuss their variation with concentration.
Q.10. Comment on the variation of conductivity and molar conductivity of an electrolyte with temperature.
Q.11. The resistance of 0.01 M NaCl solution at 25°C is 200 ohm. The cell constant of the conductivity cell used is unity. Calculate the molar conductivity of the solution.
[Ans: 500 Ω–1 cm2 mol–1]
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