The resistance of 1N solution of four different electrolytes are given below. Arrange them in increasing order of their equivalent conductance values if the same conductivity cell was used to measure the resistance of all the electrolytic solutions:
(A) 250 ohm
(B) 150 ohm
(C) 50 ohm
(D) 280 ohm
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (D), (A), (B), (C)
For the same conductivity cell and same concentration (1 N):
- Conductivity (κ) ∝ 1 / Resistance (R)
- Equivalent conductance (Λ) ∝ κ
So,
$\Lambda \propto \frac{1}{R}$
Lower resistance ⇒ higher equivalent conductance
Given resistances:
- (D) 280 Ω → lowest Λ
- (A) 250 Ω
- (B) 150 Ω
- (C) 50 Ω → highest Λ
Increasing order of equivalent conductance:
(D) < (A) < (B) < (C)