Which of the following are combustion reactions? NaNO3 (aq) arrow Na+(aq) + NO3-(aq)

C2H6 (g) + O2 (g) arrow CO2 (g) + H2O (l)

Mg(s) + HCl (aq) arrow H2 (g) + MgCl2 (aq)

HCl (aq) + NaOH (aq) arrow HOH (l) + NaCl (s)

C₂H₆(g) + O₂(g) ⇒ CO₂(g) + H₂O(l)

Explanation:

Which of the following are combustion reactions?

NaNO₃(aq) ⇒ Na⁺(aq) + NO₃⁻(aq)

NO. This is a dissociation reaction.

C₂H₆(g) + O₂(g) ⇒ CO₂(g) + H₂O(l)

YES. This is a combustion reaction because a compound reacts with oxygen to form carbon dioxide and water.

Mg(s) + HCl (aq) ⇒ H₂(g) + MgCl₂(aq)

NO. This is a single displacement reaction.

HCl(aq) + NaOH (aq) ⇒ HOH(l) + NaCl(s)

NO. This is a neutralization reaction.