2.Допишіть схеми добування кисню та розставте коефіцієнти:
1. HgO → …+ O2;

2. … → H2 + O2;

3. KMnO4 → …+…+…;

4 … → KNO2 + O2;

5 KClO3 →…+…;

6… → H2O +…;

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