Home › Maharashtra SSC (Class 10) › Chemistry › Chemical Reactions and Equations › An equation is called a 'balanced equation' when:
An equation is called a 'balanced equation' when:
Athe number of atoms of each element is equal on both sides
Bthe number of molecules of every substance is equal on both sides
Cthe total mass of each reactant is written equal on both sides
Dthe number of reactants and products is kept equal on both sides
Answer & Solution
Correct answer: A. the number of atoms of each element is equal on both sides
1. By the law of conservation of mass, atoms are neither created nor destroyed in a reaction.
2. So the number of atoms of every element on the reactant side must equal that on the product side.
3. An equation satisfying this is a balanced equation; otherwise it is unbalanced.
4. Equality of molecules, of masses written, or of species counts is not the criterion, so those options are wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.43_
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