Question

Among the following, correct statement is :

• A. Brownian movement is more pronounced for smaller particles than for bigger-particles.
• B. Sols of metal sulphides are lyophilic.
• C. Hardy Schulze law states that bigger the size of the ions, the greater is its coagulating power.
• D. One would expect charcoal to adsorb chlorine more than hydrogen sulphide.

Answer 1

Answer: (A)

Brownian movement is more pronounced for smaller particles than for bigger-particles.

Answer 2

Brownian movement is more pronounced for smaller particles than for bigger-particles. The speed of moving particles is inversely proportional to the size of the particles. Higher is the size, lower is the speed.
Thus, option A is correct.
Lyophobic sols- The colloidal system in which the particles of the dispersed phase have no or very little interactions with the dispersion medium are called lyophobic sols. For example $Fe(OH)_3$ and metal sulphides like $As_2S_3$ .
Thus, option B is incorrect.
Hardy-Schulze law states that higher the charge of the coagulating ions, greater its coagulating power, having opposite sign of solution. This law takes into consideration only the charge carried by an ion, not its size.
Thus, option C is incorrect.
Easily liquefiable gases are readily adsorbed than gases which do not liquefy easily. Easily liquefiable gases have higher critical temperature and stronger Vander Waals forces of attraction.
Thus, option D is incorrect.