We need to balance chemical reactions 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 (building blocks of matter) of the same kind before and after the reaction should be the same. So a chemical reaction should be balanced.

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Similar questions

Q. Assertion :The mass and the charge are balanced on both sides of the reaction is a balanced chemical equation. Reason: The chemical reaction should be balanced so that it can follow the law of conservation of mass.

For balancing chemical reactions, the number of the atoms on the reactant side should be equal to the number same atoms on the product side.

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

Q. The law of conservation of mass states that the total number of molecules before and after a reaction remains the same.

we learnt that the total energy during a physical or chemical process is conserved. Why, then, do we hear so much about the energy crisis? If energy can neither be created nor destroyed, we should have no worries! We should be able to perform endless activities without thinking about energy resources!

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