ANS:B - Molecular diffusion in solid is much faster than that in liquids.

The wrong statement is: "Molecular diffusion in solid is much faster than that in liquids." In reality, molecular diffusion in solids is generally much slower than in liquids. This is due to the more rigid structure and lower mobility of molecules in solids compared to liquids. In solids, diffusion typically occurs through lattice vibrations or defects in the crystal structure, which can impede the movement of molecules, resulting in slower diffusion rates. The other statements are correct:

• The binary diffusivity in liquids is indeed of the order of 10−510−5 cm²/sec.
• Particle movement from higher concentration to lower concentration does occur in diffusion processes.
• According to Poiseuille's law, the permeability decreases with an increase in temperature for the flow of a gas through a given capillary.