1) Solutions of cobaltous nitrate and sodium hydroxide are mixed.

2) Manganese(II) sulfate solution is added to a solution of ammonium sulfide.

3) Solid sodium oxide is added to distilled water.

4) Hydrogen peroxide solution is heated.

5) Solutions of ammonia and hydrofluoric acid are mixed.

6) Chlorine gas is bubbled into a solution of potassium iodide.

7) Sulfur trioxide gas is added to excess water.

8) Liquid bromine is mixed with a sodium iodide solution.

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