Mention the identification test for water.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Test**: The identification test for water involves using a chemical reaction that indicates the presence of water. One common test is the reaction with anhydrous copper(II) sulfate.

2. **Chemical Reaction**: When anhydrous copper(II) sulfate (CuSO4) is exposed to water, it undergoes a chemical change. The anhydrous form is white in color.

3. **Formation of Hydrated Copper Sulfate**: Upon the addition of water (or water vapor), the anhydrous copper(II) sulfate reacts to form hydrated copper(II) sulfate, which is represented as CuSO4·5H2O. This hydrated form is blue in color.

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