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Fill in the blanks: 1. Magnesite is calcined to give …………… 2. …………… a chemical substance that forms an easily fusible slag with gangue. 3. Flux + Gangue → …………… 4. In the extraction of iron …………… is removed as slag. 5. In the extraction of copper …………… is removed as slag. 6. Cr O can be reduced by …………… an process. 7. …………… is used as a reducing agent for the reduction of chromic oxide. 8. …………… is purified by zone refining. 9. In the mond process, impure nickel is heated with …………… compound. 10. …………… filament is used to decompose. |
Answer» 1. Magnesia 2. Flux 3. slag 4. Calcium silicate (CaSiO3) 5. Ferrous silicate (FeSiO3) 6. Aluminothermic process 7. Aluminium 8. semi-conductior 9. carbon monoxide 10. Tungsten |
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