Superphosphate is a mixture of
- A$Ca(H_2PO_4)_2 \cdot H_2O + CaCl_2 \cdot 2H_2O$
- B$Ca_3(PO_4)_2 \cdot H_2O + CaCl_2 \cdot 2H_2O$
- C$Ca_3(PO_4)_2 \cdot H_2O + 2CaSO_4 \cdot 2H_2O$
- D$Ca(H_2PO_4)_2 \cdot H_2O + 2CaSO_4 \cdot 2H_2O$
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