Question

Choose the correct option to complete the following reaction:

$2\text{Al (s)}+6\text{HCl (aq)}\to$

• A. $2{\text{AlH}}_3\text{(aq)}+3{\text{Cl}}_2\text{(g)}$
• B. ${\text{Al}}_2{\text{O}}_3\text{(aq)}+3{\text{H}}_2\text{(g)}$
• C. $2{\text{Al(OH)}}_3\text{(aq)}+3{\text{Cl}}_2\text{(g)}$
• D. $2{\text{AlCl}}_3\text{(aq)}+3{\text{H}}_2\text{(g)}$

Answer 1

The correct option is D

$2{\text{AlCl}}_3\text{(aq)}+3{\text{H}}_2\text{(g)}$

Acids react with metals to form their respective metal salt and hydrogen gas. Aluminium ($\text{Al}$) is a reactive metal. It reacts with dilute hydrochloric acid ($\text{HCl}$) to form aluminium chloride (${\text{AlCl}}_3$) and hydrogen gas (${\text{H}}_2$). The reaction involved is:

$2\text{Al (s)}+6\text{HCl (aq)}\to 2{\text{AlCl}}_3\text{(aq)}+3{\text{H}}_2\text{(g)}$