SSC MTS EXAM

Detailed explanation-1: -The substance(s) to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products.

Detailed explanation-2: -On the left side, the reactant side, there are 2 hydrogen atoms and 2 oxygen atoms. On the right side, the product side, there are 2 hydrogen atoms and only 1 oxygen atom. An important thing to remember when balancing equations is that the molecules themselves may not be changed-only their coefficients can.