Calamine,malachite,magnetite and cryolite,respectively are
- A$ZnSO_4, CuCO_3, Fe_2O_3, AlF_3$
- B$ZnCO_3, CuCO_3 \cdot Cu(OH)_2, Fe_3O_4, Na_3AlF_6$
- C$ZnSO_4, Cu(OH)_2, Fe_3O_4, Na_3AlF_6$
- D$ZnCO_3, CuCO_3, Fe_2O_3, Na_3AlF_6$
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