Which of the following chemical equations is correctly balanced?
Show the answer and explanation
Correct answer
A. 2Na + Cl2 → 2NaCl
Principle or equation
A balanced chemical equation has equal numbers of each type of atom on both sides.
Why this answer is correct
In option A, there are 2 Na atoms and 2 Cl atoms on both sides. The others have unequal atom counts or incorrect formulas.
Example
2H2 + O2 → 2H2O is balanced: 4 H and 2 O on each side.
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