A chemical equation should be balanced because:

mass is conserved in a chemical reaction.

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number of atoms before and after the reaction is same.

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the chemical equation should look good.

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energy is conserved in a chemical reaction.

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Solution

The correct option is B
number of atoms before and after the reaction is 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.

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Similar questions

Define a balanced chemical equation. Why should an equation be balanced?

(a) What is a balanced chemical equation ? Why should chemical equations be balanced ?

(b) Aluminium burns is chlorine to form aluminium chloride $(A l C l_{3})$ . Write a balanced chemical equation for this reation.

(c) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas. Write a balanced chemical equation for this reaction.

Why should we balance a chemical equation?

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