Question

Choose the products that are formed when magnesium oxide reacts with hydrochloric acid.

• A. Magnesium hydroxide and oxygen
• B. Magnesium chloride and carbon dioxide
• C. Magnesium chloride and water
• D. Magnesium hydroxide and water

Answer 1

The correct option is C Magnesium chloride and water

Metal oxides react with acids to form salt and water. So, magnesium oxide ($\text{MgO}$) reacts with hydrochloric acid ($\text{HCl}$) to form magnesium chloride (${\text{MgCl}}_2$) and water (${\text{H}}_2\text{O}$).

$\mathrm{MgO}\left(\mathrm{aq}\right)+2\mathrm{HCl}\left(\mathrm{aq}\right)\to {\mathrm{MgCl}}_2\left(\mathrm{aq}\right)+H_{2}O\left(\mathrm{aq}\right)$