Which of the following is gypsum and which one is plaster or Paris ?
(i) `CaSO_(4)*(1)/(2)H_(2)O`
(ii) `CaSO_(4)*2H_(2)O`

Explanation

To determine which compound is gypsum and which one is plaster of Paris, we need to analyze the chemical formulas provided:

1. **Identify the chemical formulas:**
- (i) `CaSO4 * (1/2)H2O`
- (ii) `CaSO4 * 2H2O`

2. **Understand the definitions:**
- Gypsum is known as calcium sulfate dihydrate, which has the formula `CaSO4 * 2H2O`.
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