Question

On increasing the temperature, the solubility of the solute in the solvent:

• A. Increase
• B. Decrease
• C. Change
• D. Does not change

Hint:

Temperature affects solubility; for most solids, higher temperatures increase solubility.

Answer 1

The Correct Option is A

Step 1: Concept.
Dissolving most solid solutes in a liquid absorbs heat from the surroundings.

Step 2: Apply Le Chatelier's principle.
Supplying more heat by raising the temperature pushes the balance toward the side that absorbs it, which is the dissolved state, so more solute goes into solution.

Step 3: Final Answer.
Raising the temperature makes the solubility of the solute Increase.

Answer 2

A kitchen example settles this just as clearly as the thermodynamic rule does.

1. Increase: Stirring sugar into cold water leaves a lot of it undissolved at the bottom, but stirring the same amount of sugar into hot water dissolves it completely, and even more sugar can be added and still dissolve. This everyday result shows solubility rising with temperature.
2. Decrease: If this were true, hot water would dissolve less sugar than cold water, which is the opposite of what actually happens in a kitchen.
3. Change: This word alone would not explain why hot tea dissolves sugar better than iced tea does, since it does not commit to a direction.
4. Does not change: If temperature made no difference, hot and cold water would dissolve the exact same amount of sugar, which does not match common experience.

The everyday observation that hot water dissolves more sugar or salt than cold water confirms the general rule for solids.

So the correct answer is Increase.