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1) A piece of calcium metal is heated strongly in nitrogen gas.

2) Sulfur dioxide gas is bubbled through distilled water.

3) A solution of potassium permanganate is added to a sodium oxalate solution.

4) A solution of potassium iodide is electrolyzed.

5) Solutions of silver nitrate and sodium chromate are mixed.

6) Dilute sulfuric acid is added to a barium chloride solution.

7) Solid lithium hydride is added to distilled water.

8) A piece of zinc metal is immersed in a copper(II) sulfate solution.

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