Q1: With rise in temperature, the solubility of ammonia in water at a fixed pressure

ANS:B - decreases

With a rise in temperature, the solubility of gases in liquids typically decreases. This is because increasing temperature provides more thermal energy to the solvent molecules, allowing them to break the intermolecular forces holding the solute particles (gas molecules) in the liquid phase. As a result, gas molecules escape more readily from the solution, leading to a decrease in solubility. For ammonia (𝑁𝐻3NH3​) in water (𝐻2𝑂H2​O), which is a gas dissolved in a liquid, the solubility generally follows this trend. Therefore, the correct answer is: decreases