Water acts as universal solvent because of:

Explanation

Heat of vaporization: The heat of vaporization is the amount of heat energy required to convert a liquid into a gas at a constant temperature and pressure. While water does have a relatively high heat of vaporization, it is not the primary reason why water acts as a universal solvent. High polarity: The correct option is high polarity. Water is a polar molecule, meaning it has a partial positive charge on one end (the hydrogen atoms) and a partial negative charge on the other end (the oxygen atom). This polarity arises due to the unequal sharing of electrons in the water molecule. The oxygen atom is more electronegative than the hydrogen atoms, pulling the electrons closer to itself and creating a dipole moment.Because of its polarity, water molecules are attracted to other polar or charged molecules, including ions and other polar substances. When a solute (substance to be dissolved) is added to water, the water molecules surround and solvate the solute, effectively breaking its interactions and allowing it to disperse evenly throughout the water. This ability to dissolve a wide variety of polar and charged substances is the reason why water is often referred to as the "universal solvent." Hydrogen bonding: Hydrogen bonding is a specific type of intermolecular bonding that occurs between hydrogen atoms bonded to electronegative atoms (such as oxygen, nitrogen, or fluorine) and lone pairs on nearby electronegative atoms. Water molecules form hydrogen bonds with each other due to the polarity of the water molecule. While hydrogen bonding does contribute to water's unique properties, including its high heat of vaporization and high surface tension, it is not the primary reason why water acts as a universal solvent. Cohesion and adhesion: Cohesion refers to the attraction between water molecules, causing them to stick together, while adhesion refers to the attraction between water molecules and other substances. These properties are responsible for phenomena like surface tension and capillary action. While cohesion and adhesion play essential roles in various biological processes, they are not the primary reasons why water acts as a universal solvent.In conclusion, option b) High polarity is the correct option. Water's high polarity allows it to act as a universal solvent, enabling it to dissolve a wide range of polar and charged substances, making it an essential medium for various biological and chemical processes.