Which one of the following reactions is not balanced? 1. 2 kno3 + 10 k → 5 k2o + n2 2. 2 so2 + o2 → 2 so3 3. sf4 + 3 h2o → h2so3 + 4 hf

2 KNO₃ + 10 K → 5 K₂O + N₂  (option 1)

Explanation:

1. 2 KNO₃ + 10 K → 5 K₂O + N₂

We have in reactant side:

2 K, 2N, 6O and 10 K. In conclussion, 12 K, 2N and 6 O

We have in product side.

10 K, 5O and 2 N

This equation is unbalanced

2. 2 SO₂ + O₂ → 2 SO₃

In reactant side we have 2 S and 6 O

In product side we have 2 S and 6 O

3. SF₄ + 3 H₂O → H₂SO₃ + 4 HF

In reactant side we have 1 S, 4F, 6 H and 3 O

In product side we have 1 S, 4F, 6 H and 3 O