JEE Main levelSingle correct optionDifficulty 2 of 3rg123
For which of the following gases is the van der Waals constant b the largest?
AHe
BHX2
CNe
DClX2
Answer: D
b is proportional to the molecular volume. Chlorine is the largest molecule among these, so its b (0.0562Lmol−1) exceeds those of He (0.0237), HX2 (0.0266) and Ne (0.0171).