Answer:

(a)endothermic and reversible process

Explanation:

When a gas dissolves in a liquid, it involves the breaking of intermolecular forces between gas molecules and the formation of new intermolecular forces between gas molecules and liquid molecules. This process requires energy, which is why it is considered endothermic. In other words, heat is absorbed from the surroundings during the dissolution process.

Increasing the temperature of the system provides more thermal energy to the molecules, making it easier for the intermolecular forces to be overcome. This results in a decrease in the solubility of gases in liquids. As the temperature rises, the gas molecules have enough energy to escape from the liquid phase and return to the gas phase.

Additionally, dissolution is a reversible process. This means that the dissolved gas molecules can also escape from the liquid and return to the gas phase. The balance between the dissolution and escape of gas molecules is influenced by factors such as temperature and pressure.

In summary, the solubility of gases in liquids decreases with a rise in temperature because dissolution is an endothermic and reversible process. The increase in temperature provides more energy to the gas molecules, making it easier for them to escape from the liquid phase and decrease the overall solubility.

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The solubility of gases in liquids decreases with a rise in temperature because dissolution is an:

(b) exothermic and reversible process

When gases dissolve in liquids, it usually releases heat (exothermic) and is a reversible process. Increasing the temperature provides more thermal energy to the gas molecules, making them less likely to remain dissolved in the liquid, which leads to decreased solubility.