Step-by-step explanation:
When we stir a solute in a solution then number of collisions between the solute and solvent increases. As a result, rate of dissolution of the solid increases as rate of reaction increases.
On the other hand, when we do not stir a solution then there will be no collisions between the molecules of solute and solvent. As a result, solute will not dissolve into the solution.
Thus, we can conclude that there will be decrease in rate of dissolution.