The molar conductivity of a weak electrolyte when plotted against the square root of its concentration, which of the…
Electrochemistry · Class 12 · JEE Main Previous Year Question
The molar conductivity of a weak electrolyte when plotted against the square root of its concentration, which of the following is expected to be observed?
- a
A small decrease in molar conductivity is observed at infinite dilution
- b
A small increase in molar conductivity is observed at infinite dilution
- c
Molar conductivity increases sharply with increase in concentration
- d✓
Molar conductivity decreases sharply with increase in concentration
Molar conductivity decreases sharply with increase in concentration
Strategy: Recall the molar conductivity behavior for weak electrolytes. They do not follow a linear relationship with and show a dramatic increase in only near the limit of infinite dilution.
Analysis:
- As concentration () increases, the of dissociation () for a weak electrolyte decreases rapidly according to Ostwald's Dilution Law.
- Therefore, there is a sharp decrease in molar conductivity () as concentration increases, starting from the near-infinite dilution state.
- Option (d) correctly describes this steep curve behavior.
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