Question

When magnesium ribbon reacts with air, heat and light is produced. The balanced chemical equation is:

$2\text{Mg}+{\text{O}}_2\to 2\text{MgO}$

The reactant(s) in the reaction is/are:

• A. Mg
• B. $O_2$
• C. MgO
• D. $M{g}_{2}O$

Answer 1

Answer: (A), (B)

The correct options are
A

Mg

B

$O_2$

A reactant is a substance that takes part in and undergoes the chemical reaction whereas a product is a substance that is formed as the result of a chemical reaction. Reactants are written on the left side of the arrow.

The reactants in the given reaction are magnesium $\text{Mg}$ and oxygen ${\text{O}}_2$. The product formed is magnesium oxide $\text{Mg}$ .