A chemical equation is an expression which is representative of the nature and the amount of substances that are involved in a given reaction. For example if we consider the formation of water, this can be expressed through a chemical equation as follows:
2H2(g) + O2(g) → 2H2O (l)
The information which can be deduced is two-fold:
1) It gives a qualitative description about the state/phase of the reactants and products
2) It gives a quantitative description i.e. the mole ratios of the reactants and products or the reaction stoichiometry.
Ans: C) Chemical equations provide a qualitative and quantitative description of a reaction.
