Match the important chemical given in column (A) with the chemical fomulae given in Column (B).
`{:("Column (A), Column (B)"),("(a) Plaster of paris, (i)" Ca(OH)_(2)),("(b) Gypsum (ii)"CaSO_(4) .(1)/(2)H_(2)O),("(c) bleaching powder (iii)" CaSO_(4).2H_(2)O),("(d) Slaked lime (iv)"CaOCl_(2)):}`

Explanation

To solve the problem of matching the chemicals in Column (A) with their corresponding chemical formulae in Column (B), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Chemical for (a) Plaster of Paris:**
- Plaster of Paris is known to be calcium sulfate hemihydrate.
- The chemical formula for Plaster of Paris is \( \text{CaSO}_4 \cdot \frac{1}{2} \text{H}_2\text{O} \).
- **Match:** (a) Plaster of Paris → (ii) \( \text{CaSO}_4 \cdot \frac{1}{2} \text{H}_2\text{O} \)
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