AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
A chemical equation must be balanced due to the Law of Conservation of Mass, which states that mass can neither be created nor destroyed in a chemical reaction.
Examiners expect the name of the law clearly stated. You may add a brief reason — that the number of atoms of each element must be equal on both sides — to strengthen a 1-mark answer, but the law's name is the core requirement.