Here's the balanced symbol equation and physical states for the reaction of calcium oxide with hydrochloric acid:

CaO(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l)

Here's a breakdown of the equation:

* CaO(s): Calcium oxide is a solid (s).

* HCl(aq): Hydrochloric acid is an aqueous solution (aq) meaning it's dissolved in water.

* CaCl₂(aq): Calcium chloride is also an aqueous solution (aq).

* H₂O(l): Water is a liquid (l).

Explanation:

Calcium oxide (CaO) reacts with hydrochloric acid (HCl) to produce calcium chloride (CaCl₂) and water (H₂O). This reaction is a neutralization reaction where a base (calcium oxide) reacts with an acid (hydrochloric acid) to form a salt (calcium chloride) and water.