Question

Consider the statements S1 and S2 :
S1 : Conductivity always increases with decrease in the concentration of electrolyte.
S2 : Molar conductivity always incrteases with decrease in the concentration of electrolyte.
The correct option among the following is :

• A. Both S1 and S2 are correct
• B. S1 is wrong and S2 is correct
• C. S1 is correct and S2 is wrong
• D. Both S1 and S2 are wrong

Answer 1

Answer: (B)

$S_1$ is wrong and $S_2$ is correct
On dilution, number of ions per ml decreases so conductivity decreases hence $S1$ is wrong.
${\Lambda }_M=\frac{1000\times k}{C}$
On dilution $C$ and $k$ both decrease but the effect of $C$ is more dominating so ${\Lambda }_M$ increases hence $S_2$ is right.