Question

A solution which has more of solute, at a given temperature than that of saturated solution is called a:

• A. Super saturated solution
• B. Unsaturated solution
• C. Colloidal solution
• D. Suspension

Hint:

A supersaturated solution contains more solute than can normally dissolve at a given temperature and is typically unstable.

Answer 1

The Correct Option is A

A solution that contains more solute than it can normally hold at a given temperature is known as a super saturated solution. This state occurs when a solution is heated and more solute is dissolved than would be possible at room temperature. Upon cooling, the solution is in a super saturated state until the excess solute precipitates out.

• Super saturated solution: Contains more solute than a saturated solution at the same temperature. It is unstable and can precipitate the solute upon slight disturbance or the addition of a seed crystal.
• Unsaturated solution: Can dissolve more solute at the given temperature. It is not yet at equilibrium.
• Colloidal solution: A mixture where one substance is dispersed evenly throughout another at the microscopic level. Colloids do not involve extra solute beyond saturation.
• Suspension: A heterogeneous mixture where solute particles do not dissolve but remain suspended, which can eventually settle with time.

Hence, a solution with more solute than the saturated solution at the same temperature is categorized as a super saturated solution.

Answer 2

The question describes a solution holding more solute than a saturated solution can hold at the same temperature. Test each option against that description.

1. Super saturated solution: this is exactly a solution pushed past its normal saturation point, usually by dissolving solute at a higher temperature and then cooling it slowly. It is unstable and drops the extra solute out as crystals if disturbed. This matches the description directly.
2. Unsaturated solution: this can still dissolve more solute, which means it holds less than a saturated solution, the opposite of what the question describes.
3. Colloidal solution: this is defined by particle size, not by how much solute it holds compared to saturation, so it does not fit here.
4. Suspension: this has undissolved particles floating in the liquid rather than extra dissolved solute, so it does not match either.

Only a super saturated solution holds more solute than its saturated form at the same temperature.

So the correct answer is super saturated solution.