Balance the following chemical equations and write the word equations for them: a) ZnO + HCl -> ZnCl2 + H2O; b) MgO + H2SO4 -> MgSO4 + H2O; c) ZnO + H2SO4 -> ZnSO4 + H2O; d) MgO + HCl -> MgCl2 + H2O.

(It is already balanced.)

$$\text{MgO} + \text{H}_2\text{SO}_4 \rightarrow \text{MgSO}_4 + \text{H}_2\text{O}$$

(It is already balanced.)

$$\text{ZnO} + \text{H}_2\text{SO}_4 \rightarrow \text{ZnSO}_4 + \text{H}_2\text{O}$$

$$\boxed{\text{Magnesium oxide} + \text{Hydrochloric acid} \rightarrow \text{Magnesium chloride} + \text{Water}}$$

2.
Magnesium oxide is a basic oxide. When it reacts with water, it forms magnesium hydroxide ($\text{Mg(OH)}_2$), which is a sparingly soluble base. The solution formed will be alkaline. If a universal indicator is added, it will turn blue or purple, indicating a pH greater than 7.

3.