Q1: In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is

ANS:C - decreased with the increase in pressure.

The scenario described suggests that the solution is experiencing a positive deviation from Raoult's law, which occurs when the intermolecular forces between unlike molecules are weaker than those between like molecules. In such cases, the total volume of the solution can be more than the sum of the volumes of its components in their pure states. In such a solution:

• If the intermolecular forces between solute and solvent molecules are weaker than those between solvent molecules, the solute molecules tend to spread out more in the solvent, increasing the volume of the solution.
• The solubility of the solute in the solvent in such cases is typically increased compared to what would be expected based on Raoult's law.
• This increase in solubility with increased volume is typically unchanged by changes in pressure.