Answer: physical change
Explanation:
A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions.
Example: Dissolution of salt in water
A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions.
Example: Oxidation of magnesium to give magnesium oxide
[tex]2Mg+O_2\rightarrow 2MgO[/tex]
Thus physical change occurs when salt dissolves in water.
