A chemical equation should be balanced because:

Mass should be conserved

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No of atoms before and after the reaction should be same.

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Both (No of atoms before and after the reaction should be same and Mass should be conserved)

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None of the given statement

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Solution

The correct options are
A
Mass should be conserved

B
No of atoms before and after the reaction should be same.

Mass can neither be created nor destroyed in a chemical reaction, i.e. mass is conserved in a chemical reaction. This implies that the number of atoms before and after the reaction should be the same. So a chemical equation should be balanced.

Suggest Corrections

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For the given reaction to be balanced, the number of atoms of an element on both side of the reaction should be equal.

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