Question

Which of the following is combustion reaction?

• A. $C + O_2 \to CO_2$
• B. $CH_4 + O_2 \to CO_2 + H_2O$
• C. $Mg + O_2 \to MgO$
• D. all of these

Answer 1

Answer: (D)

When all substances in a compound combine with oxygen and produces $CO_{2}$ and $H_{2}O$, it is commonly called burning
During combustion substance reacts with an oxidising agent such as $O_{2}$ and $F_{2}$. Not all combustion reaction releases $CO_{2}$ and $H_{2}O$ e.g.
$Mg+O_{2} \to MgO+{\text{Heat}}$