Step 1: Understanding the Question:
Extent of physical adsorption depends on critical temperature of the gas.
Step 2: Key Formula or Approach:
Higher the critical temperature, greater the adsorption.
Step 3: Detailed Explanation:
Critical temperatures: Cl\(_2\) (417 K) > O\(_2\) (154 K) > N\(_2\) (126 K) > H\(_2\) (33 K). Cl\(_2\) is most easily liquefiable, hence adsorbed most.
Step 4: Final Answer:
Option (B) is correct.