Metals and Non-metals · Class 10 Science · Chapter 3
🔬 Metals and Non-metals
CBSE Class 10 · Science · Chapter 3
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| 90% | Extraction of moderately reactive metal (Zn/Fe/Cu) — roasting + reduction + refining — Three equations: ore → oxide → metal. Always identify the ore correctly (sulphide → roast, carbonate → calcine). | 5 MARKS |
| 95% | Reactivity series — predict displacement + explain extraction route — List at least 8 metals in correct order and quote ONE balanced displacement equation. | 5 MARKS |
| 85% | Corrosion / rusting — two conditions + two prevention methods — Conditions = O₂ + H₂O (both). Methods: galvanisation, painting, alloying, oiling. | 3 MARKS |
| 75% | Properties of ionic compounds (high m.p., conductivity in molten state) — Always include WHY (strong electrostatic attraction; ions locked in lattice when solid). | 3 MARKS |
| 70% | Amphoteric oxides — Al₂O₃ / ZnO react with BOTH acid and base — Two equations needed: oxide + HCl AND oxide + NaOH. | 2 MARKS |
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