When a saturated solution of sodium chloride is heated, it:

Becomes unsaturated

The correct answer is option 2. Becomes unsaturated.

When a saturated solution of sodium chloride (NaCl) is heated, it becomes unsaturated.

A saturated solution is one in which the maximum amount of solute has dissolved in the solvent at a given temperature. Any additional solute will not dissolve unless the conditions are changed.

When you heat a saturated solution of sodium chloride, the solubility of NaCl in water increases. This means that water can now dissolve more NaCl at the higher temperature. As a result, the solution that was saturated at the lower temperature can dissolve additional NaCl when heated.

Here is a more detailed explanation:

Solubility and Temperature: For most solids, including sodium chloride, solubility increases with an increase in temperature. This means that more NaCl can be dissolved in water at higher temperatures than at lower temperatures.

Saturated Solution: At a lower temperature, the solution is saturated, meaning it contains the maximum amount of dissolved NaCl for that temperature.

Heating the Solution: When the temperature of the saturated solution is increased, the water can dissolve more NaCl because the solubility limit has increased.

Resulting State: Since the solution can now hold more NaCl than it did at the lower temperature, the solution becomes unsaturated with respect to NaCl at the new, higher temperature.

Heating a saturated solution of sodium chloride increases the solubility of NaCl, causing the solution to become unsaturated.