Question

The molar conductivity for electrolytes A and B are plotted against C1/2 as shown below. Electrolytes A and B respectively are :

• A.

  A	B
  Weak electrolyte	Weak electrolyte

• B.

  A	B
  Strong electrolyte	strong electrolyte

• C.

  A	B
  Weak electrolyte	strong electrolyte

• D.

  A	B
  Strong electrolyte	Weak electrolyte

Answer 1

Answer: (C)

A	B
Weak electrolyte	strong electrolyte

Answer 2

Explanation: The graph shows the variation of molar conductivity ($\Lambda_m$) with $C^{1/2}$, the square root of concentration:

1. Electrolyte A: The molar conductivity of $A$ increases steeply as $C^{1/2}$ approaches 0, indicating $A$ is a weak electrolyte. For weak electrolytes, the molar conductivity increases significantly with dilution due to ionization.
2. Electrolyte B: The molar conductivity of $B$ remains relatively constant with $C^{1/2}$, indicating $B$ is a strong electrolyte. For strong electrolytes, the variation of molar conductivity with concentration is minimal.

Therefore:

Electrolyte A → Weak electrolyte, Electrolyte B → Strong electrolyte.

Final Answer is Option (3).