Q1: Molecular diffusivity of a liquid

ANS:A - increases with temperature.

The molecular diffusivity of a liquid generally increases with temperature. Explanation:

• Molecular diffusivity refers to the ability of molecules to move and spread within a substance due to random motion.
• Diffusion is a temperature-dependent process. As temperature increases, the kinetic energy of molecules also increases.
• Higher kinetic energy leads to increased molecular movement and collision frequency, facilitating faster diffusion.
• Therefore, at higher temperatures, molecules in a liquid have greater thermal energy, allowing them to diffuse more rapidly through the liquid.
• Conversely, at lower temperatures, molecular motion and diffusion rates are slower due to reduced kinetic energy.
• Overall, molecular diffusivity tends to increase with temperature for most liquids, although there may be exceptions depending on the specific properties of the liquid and its molecular interactions.