Given below are two statements: Statement I: For KI, molar conductivity increases steeply with dilution. Statement II:…
Electrochemistry · Class 12 · JEE Main Previous Year Question
Given below are two statements:
Statement I: For KI, molar conductivity increases steeply with dilution. Statement II: For carbonic acid, molar conductivity increases slowly with dilution.
In the light of the above statements, choose the correct answer from the options given below:
- a
Statement I is correct and Statement II is incorrect
- b
Both Statement I and Statement II are false
- c
Statement I is true but Statement II is false
- d✓
Statement I is false but Statement II is true
Statement I is false but Statement II is true
Strategy: Distinguish between the dilution behavior of strong and weak electrolytes. Identify the electrolyte type for and Carbonic acid.
Analysis:
- KI: This is a strong electrolyte. According to the Debye-Hückel-Onsager equation, its molar conductivity increases slowly and linearly with the square root of concentration upon dilution. Statement I is false because it claims a "steep" increase.
- Carbonic acid (): This is a weak electrolyte. At moderate concentrations, the increase is slow, but it rises steeply only at extremely high dilutions. Statement II is generally ac\cepted as true compared to KI.
Conclusion: Statement I is false, Statement II is true.
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