The compound formed when gypsum is dissolved in aqueous ammonium sulphate solution is:
- A$CaSO_4 \cdot NH_4Cl \cdot H_2O$
- B$CaCl_2 \cdot (NH_4)_2SO_4 \cdot H_2O$
- C$CaSO_4 \cdot (NH_4)_2SO_4 \cdot 2H_2O$
- D$CaCl_2 \cdot NH_4Cl \cdot 2H_2O$
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