Q1: Crystallisation of solids from a homogeneous solution is a/an __________ process.

ANS:A - exothermic

An exothermic process is one that releases heat energy to its surroundings during the course of the reaction or phase change. In the context of crystallization from a homogeneous solution, exothermicity means that heat is liberated as the solute molecules or ions come together to form a solid crystal structure. During crystallization, molecules or ions in the solution lose their kinetic energy as they bond together to form the ordered structure of the solid. This release of energy occurs because the bonds formed between the solute particles are typically stronger than the interactions between the solute and the solvent in the solution. The excess energy is released into the surroundings in the form of heat. In summary, in an exothermic process like crystallization from a homogeneous solution, heat is released as the solute transitions from a dissolved state to a solid state, leading to an increase in temperature in the surroundings.