Consider the statements S1 and S2: S1: Conductivity always increases with decrease in the concentration of electrolyte.…
Electrochemistry · Class 12 · JEE Main Previous Year Question
Consider the statements S1 and S2:
S1: Conductivity always increases with decrease in the concentration of electrolyte. S2: Molar conductivity always increases with decrease in the concentration of electrolyte.
The correct option among the following:
- a✓
S1 is wrong and S2 is correct
- b
S1 is correct and S2 is wrong
- c
Both S1 and S2 are correct
- d
Both S1 and S2 are wrong
S1 is wrong and S2 is correct
Strategy: Define and distinguish specific conductan\ce () and molar conductivity (). Recall how each changes when concentration decreases (dilution).
Analysis:
- S1 (Conductan\ce): Decrease in concentration (dilution) means there are fewer ions in a fixed volume (like ). Therefore, decreases. Statement S1 is false.
- S2 (Molar Conductivity): accounts for the total conductivity of 1 mole of electrolyte. Even if drops, the effect of redu\ced inter-ionic interferen\ce (strong) or increased dissociation (weak) makes the total molar conductan\ce increase. Statement S2 is correct.
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