Balance the following chemical equation: KNO₃ → KNO₂ + O₂?

KNO₃ → KNO₂ + 2O₂

2KNO₃ → 2KNO₂ + O₂

2KNO₃ → 2KNO₂ + 3O₂

None of these

Balancing the equation requires equal atoms of each element on both sides.

Here, 2 molecules of KNO₃ decompose into 2 molecules of KNO₂ and 1 molecule of O₂ gas.