Target Exam

CUET

Subject

Chemistry

Chapter

Physical: Electro Chemistry

Question:

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:

Options:

(A), (B), (C), (D)

(A), (B), (D), (C)

(D), (A), (B), (C)

(C), (B), (A), (D)

Correct Answer:

(D), (A), (B), (C)

Explanation:

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)