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Why is changing subscripts considered a serious error while balancing a chemical equation?

Answer and explanation

Correct answer: Because it changes the composition and identity of the substance.

A subscript gives the fixed ratio of atoms in one molecule or formula unit. For example, H₂O and H₂O₂ are different substances because their atomic compositions differ. Changing a subscript while balancing would therefore change the reactant or product itself, not merely its amount. The correct method is to change coefficients placed before formulas, which alter the number of particles without changing identity. Hence A is correct; B, C and D do not describe the consequence.

Related tags

Chemical EquationsSubscriptsCoefficientsBalancing EquationsChemical FormulaChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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