Question

Identify the correct balanced equation from the following chemical reactions.

• A. ${\text{NaHCO}}_3\to {\text{Na}}_2{\text{CO}}_3+{\text{CO}}_2+{\text{H}}_2\text{O}$
• B. ${\text{CaC}}_2+{\text{H}}_2\text{O}\to {\text{C}}_2{\text{H}}_2+{\text{Ca(OH)}}_2$
• C. $\text{HgO}\to {\text{Hg + O}}_2$
• D. ${\text{2ClO}}_2+{\text{H}}_2\text{O}\to {\text{HClO}}_2+{\text{HClO}}_3$

Answer 1

The correct option is D

${\text{2ClO}}_2+{\text{H}}_2\text{O}\to {\text{HClO}}_2+{\text{HClO}}_3$

A balanced chemical equation has an equal number of atoms on the reactant and product side.
Equation: ${\text{2ClO}}_2+{\text{H}}_2\text{O}\to {\text{HClO}}_2+{\text{HClO}}_3$

If you count the number of atoms for equation given above we have:- The number of chlorine atom present on reactant and product side is 2.
- The number of oxygen atoms present on reactant and product side is 5.
- The number of hydrogen atoms present on reactant and product side is 2.
Hence, the equation is balanced.

In ${\text{2NaHCO}}_3\to \text{5}{Na}_2{\text{CO}}_3+{\text{CO}}_2+{\text{H}}_2\text{O}$ the number of sodium atoms, oxygen atoms and hydrogen atoms are not equal in the reactant and product side.

In ${\text{CaC}}_2+{\text{H}}_2\text{O}\to {\text{C}}_2{\text{H}}_2+{\text{Ca(OH)}}_2$ the number of hydrogen atoms and oxygen atoms are not equal in the reactant and product side.

In $\text{2HgO}\to {\text{3Hg + 4O}}_2$ the number of mercury atoms and oxygen atoms are not equal in the reactant and product side.