JEE Main · 2019 · 10 Apr 2019 · Shift 1 · Redox Reactions and Electrochemistry

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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 is:

(A)S1 is wrong and S2 is correct✓ Correct
(B)Both S1 and S2 are wrong
(C)S1 is correct and S2 is wrong
(D)Both S1 and S2 are correct

Answer: (A)

Solution

Molar conductivity, conductivity and concentration are tied by

λ_{m} = \frac{K}{C}

. The first statement is wrong: conductivity rises as concentration increases, because there are then more ions per unit volume, not fewer. The second is right: molar conductivity rises as concentration falls, since dilution eases inter-ionic interactions and lets the ions move more freely. So the first claim fails and the second holds.

JEE Main · 2019 · 10 Apr 2019 · Shift 1 · Single correct option

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JEE Main · 2019 · 10 Apr 2019 · Shift 1 · Redox Reactions and Electrochemistry

Solution

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