Answer : The balanced chemical reaction will be,

Explanation :
Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.
The unbalanced chemical reaction is,

This reaction is an unbalanced chemical reaction because in this reaction number atoms are not balanced.
In order to balance the chemical equation, the coefficient '2' put before the
and
then we get the balanced chemical equation.
The balanced chemical reaction will be,
