Anhydrous calcium chloride and silica gel both are hygroscopic, but calcium chloride takes in more moisture because it absorbs moisture whereas silica gel adsorbs it.

Gelatin forms a lyophilic sol. However, in a strongly acidic medium, it forms a positively charged sol due to the selective adsorption of H⁺ ions from the medium.

The force of attraction between adsorbate and adsorbent molecules is fairly high, and adsorbate cannot be easily dislodged by change in temperature, pressure, etc. So, chemisorption is irreversible.

Number of moles of CH₃COOH adsorbed = 0.75 - 0.73 = 0.02
Mass of CH₃COOH adsorbed = 0.02 × 60 = 1.2 g
x/m = 1.2/5 = 0.24

Only option 1 is incorrect. Since physical adsorption is an exothermic process, it occurs more readily at lower temperatures and decreases with increase in temperature (Le-Chatelier's Principle).

Adsorption theory explains the mechanism of a reaction based on heterogeneous catalysis, where a solid catalyst is used and the reactants are in the gaseous state.

Statement 'a' is wrong as different enzymes are active at different pH values, but most enzymes function in pH around 7.4.

Sorption is the common term used for both absorption and adsorption. Absorption is the incorporation of a substance in one state into another of a different state (e.g., liquids being absorbed by a solid or gases being absorbed by water). Adsorption is the physical adherence or bonding of ions and molecules onto the surface of another molecule. The term 'sorption' is preferred when it is suspected that both processes are operative.