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.
Frequently asked questions
What is the correct answer to this question?
Because it changes the composition and identity of the substance.
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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