Calamine, malachite, magnetite, and cryolite, respectively, are:
Show Hint
- ZnCO$_3$, CuCO$_3$·Cu(OH)$_2$, Fe$_3$O$_4$, Na$_3$AlF$_6$
- ZnSO$_4$, Cu(OH)$_2$, Fe$_3$O$_4$, Na$_3$AlF$_6$
- ZnSO$_4$, CuCO$_3$, Fe$_2$O$_3$, AlF$_3$
- ZnCO$_3$, CuCO$_3$, Fe$_2$O$_3$, Na$_3$AlF$_6$
The Correct Option is A
Solution and Explanation
Step 1: Understanding Mineral Composition
Different ores and minerals have characteristic chemical compositions: 1. Calamine (\( ZnCO_3 \)):
- It is the main ore of zinc and contains zinc carbonate.
- When heated, it decomposes to form zinc oxide: \[ ZnCO_3 \rightarrow ZnO + CO_2 \]
2. Malachite (\( CuCO_3 \cdot Cu(OH)_2 \)):
- It is a basic copper carbonate mineral. - It gives green color to many copper-rich rocks.
3. Magnetite (\( Fe_3O_4 \)): - It is one of the most common iron ores. - It contains mixed oxidation states of iron.
4. Cryolite (\( Na_3AlF_6 \)): - It is a fluoride mineral used in the Hall-Héroult process for aluminum extraction.
- It acts as a flux to lower the melting point of alumina.
Step 2: Identifying the Correct Answer
- The correct composition is ZnCO$_3$, CuCO$_3$·Cu(OH)$_2$, Fe$_3$O$_4$, Na$_3$AlF$_6$.
Final Answer: The correct answer is (A).
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