Q. Which of the following is/are correct for a balanced chemical equation?

1. It is based on law of conservation of mass.
2. The physical state makes the chemical reaction less informative.

Select the correct answer from the codes given below:
Answer: Only 1
Notes: The law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction. That is, the total mass of the elements present in the products of a chemical reaction has to be equal to the total mass of the elements present in the reactants. In other words, the number of atoms of each element remains the same, before and after a chemical reaction. To make a chemical equation more informative, the physical states of the reactants and products are mentioned along with their chemical formulae. The gaseous, liquid, aqueous and solid states of reactants and products are represented by the notations.