Name one reagent or one operation to distinguish between :
(i) `BeSO_4 and BaSO_4` (ii) `Be(OH)_2 and Ba(OH)_2`

Explanation

To distinguish between the compounds BeSO₄ (Beryllium sulfate) and BaSO₄ (Barium sulfate), as well as between Be(OH)₂ (Beryllium hydroxide) and Ba(OH)₂ (Barium hydroxide), we can perform the following steps:

### Step 1: Distinguishing BeSO₄ and BaSO₄

1. **Perform a Water Solubility Test**:
- Add a small amount of each sulfate (BeSO₄ and BaSO₄) to separate test tubes containing water.
- Stir the mixtures and observe whether they dissolve.

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