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The number of correctly matched combinat...

The number of correctly matched combination is/are
`{:("Ore","Element"),("Chalcopyrite","Cu"),("Limestone","Ca"),("Corundum","Al"),("Magnetite","Fe"),("Pyrolusite","Mn"),("Cassiterite","Zn"),("Cinnabar","Hg"),("Calamine","Ca"),("Siderite","Sn"),("Cerussite","Pb"):}`

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The correct Answer is:
To determine the number of correctly matched combinations of ores and their corresponding elements, we will analyze each pair one by one. 1. **Chalcopyrite - Cu**: - Chalcopyrite has the formula CuFeS₂. - It contains copper (Cu). - **Correct Match**: Yes. 2. **Limestone - Ca**: - Limestone has the formula CaCO₃. - It contains calcium (Ca). - **Correct Match**: Yes. 3. **Corundum - Al**: - Corundum has the formula Al₂O₃. - It contains aluminum (Al). - **Correct Match**: Yes. 4. **Magnetite - Fe**: - Magnetite has the formula Fe₃O₄ or FeO·Fe₂O₃. - It contains iron (Fe). - **Correct Match**: Yes. 5. **Pyrolusite - Mn**: - Pyrolusite has the formula MnO₂. - It contains manganese (Mn). - **Correct Match**: Yes. 6. **Cassiterite - Zn**: - Cassiterite has the formula SnO₂. - It does not contain zinc (Zn). - **Correct Match**: No. 7. **Cinnabar - Hg**: - Cinnabar has the formula HgS. - It contains mercury (Hg). - **Correct Match**: Yes. 8. **Calamine - Ca**: - Calamine is typically represented as ZnCO₃ or an oxide of zinc (ZnO). - It does not contain calcium (Ca). - **Correct Match**: No. 9. **Siderite - Sn**: - Siderite has the formula FeCO₃. - It does not contain tin (Sn). - **Correct Match**: No. 10. **Cerussite - Pb**: - Cerussite has the formula PbCO₃. - It contains lead (Pb). - **Correct Match**: Yes. Now, let's count the correct matches: - Correct Matches: Chalcopyrite, Limestone, Corundum, Magnetite, Pyrolusite, Cinnabar, Cerussite. - Total Correct Matches: 7. Thus, the number of correctly matched combinations is **7**.
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