JEE Main 2025 — Electrochemistry Question with Solution
From: JEE Main 2025 (Online) 29th January Morning Shift
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?
Choose an option
Show full solutionCorrect option: B
Molar conductivity decreases sharply with increase in concentration.
Step-by-step explanation
The molar conductivity of a weak electrolyte is plotted against the square root of its concentration:
-concentration of weak electrolyte
Weak electrolytes give curved decreasing graph.
1) Molar conductivity increases sharply with increase in concentration.
Incorrect.
With increase in concentration, molar conductivity decreases and it is lean from the graph of molar conductivity vs .
2) Molar conductivity decreases sharply with increase in concentration.
Correct
From the graph it is clean that, molar conductivity decreases sharply with increase in concentration.
3) A small increase in molar conductivity is observed at infinite dilution.
Incorrect
There is no small increase in molas conductivity with increase in concentration for a weak electrolyte. And there is no small increase in mola conductivity. Significant increase occurs.
4) A small decrease in molar conductivity is observed at infinite dilution.
Incorrect
For a weak electrolyte, the molar conductivity significantly increases with dilution, especially at infinite dilution.
Correct answer:
Option 2) Molen conductivity decreases sharply with increase in concentration.
Practice this on the real CBT interface
Solve this JEE Main question (and the rest of the Electrochemistry chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.
Solve interactively →About this question
This is a previous-year question from JEE Main 2025, covering the Electrochemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.