Reactions among the following that occur during calcination are:
| a. | CaCO3 → CaO + CO2 |
| b. | 2FeS2 + \(\frac{11}{2}\)O2 → Fe2O3 + SO2 |
| c. | Al2O3.xH2O → Al2O3 + xH2O |
| d. | ZnS + \(\frac{3}{2}\)O2 → ZnO + SO2 |
Choose the correct option:
1. a and b
2. b and c
3. c and d
4. a and c
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