Q1: With increase in temperature, the leaching rate increases because of the

ANS:C - both (a) and (b).

With an increase in temperature, the leaching rate increases because of both the increased diffusivity and decreased viscosity of the liquid. When temperature increases:

1. Increased Diffusivity: The kinetic energy of molecules increases, leading to greater molecular movement. This results in enhanced diffusion of solute molecules through the liquid phase, allowing for faster mass transfer between the solid and liquid phases.
2. Decreased Viscosity of Liquid: Higher temperatures reduce the cohesive forces between molecules, leading to decreased viscosity of the liquid. This decrease in viscosity reduces the resistance to flow, facilitating faster movement of the solvent and solute molecules, which in turn enhances the leaching rate.