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Identify the chemical compositions of calamine, malachite, magnetite, and cryolite in the correct sequence.

1. ZnCO3, CuCO3·Cu(OH)2, Fe3O4, Na3AlF6
2. ZnSO4, CuCO3·Cu(OH)2, Fe3O4, AlF3
3. ZnSO4, Cu(OH)2, Fe3O4, Na3AlF6
4. ZnCO3, CuCO3·Cu(OH)2, Fe3O4, Na3AlF6

Correct answer: ZnCO3, CuCO3·Cu(OH)2, Fe3O4, Na3AlF6

Solution

Calamine is ZnCO3, malachite is CuCO3.Cu(OH)2, magnetite is Fe3O4, and cryolite is Na3AlF6. This is option 0, whereas the stored option 1 wrongly lists ZnSO4 and AlF3.

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