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Revision Notes
Metallurgy — Revision Notes
Tamil Nadu Board · Class 12 · Chemistry
Metallurgy revision notes for Tamil Nadu Board Class 12 Chemistry: 4 topics in quick points. Part of the Tamil Nadu Board Class 12 Chemistry syllabus.
45 questions29 flashcards5 concepts
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Key Topics to Revise
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1. Occurrence of Metals: Minerals and Ores
- Pure metals occur in nature in two forms: native state (free elements) and combined state (as compounds)
- Less reactive metals like Cu, Ag, Au, Pt occur as native elements in significant amounts
- Reactive metals like alkali metals occur only in combined state (oxides, sulphides, silicates, carbonates)
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2. Concentration of Ores
- Concentration (ore dressing) is the process of removing gangue to increase metal percentage in ore
- Choice of method depends on: nature of ore, type of impurity, specific gravity difference, and magnetic properties
- Gravity/Hydraulic wash: Used for ores with large specific gravity difference (haematite, tin stone, native gold)
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3. Conversion of Ores into Oxides
- Before reduction, ore is converted to oxide form because oxides are easier to reduce than other compounds
- Roasting: Oxidation of sulphide ores by heating with excess O₂ below melting point of metal
- Roasting reactions: 2PbS + 3O₂ → 2PbO + 2SO₂↑; 2ZnS + 3O₂ → 2ZnO + 2SO₂↑; 2Cu₂S + 3O₂ → 2Cu₂O + 2SO₂↑
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4. Reduction of Metal Oxides
- Reduction is conversion of metal oxide to elemental metal; metal goes from +2/+3 state to 0 state
- Choice of reducing agent depends on: metal reactivity, thermodynamic feasibility, economic factors
- Carbon cannot reduce oxides of very reactive metals (Na, K, Ca, Al) due to stability of their oxides
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Full NotesKey Concepts
A mineral is a naturally occurringRaw ores contain gangue (nonmetallic impuritiesLeaching dissolves metals into solution whileRoasting heats sulfide ores with excessMetal oxides are reduced to metals
Frequently Asked Questions
What are the important topics in Metallurgy for Tamil Nadu Board Class 12 Chemistry?
Key topics in Metallurgy include Occurrence of Metals: Minerals and Ores, Concentration of Ores, Conversion of Ores into Oxides, Reduction of Metal Oxides. Study these first, then practise questions on each for the Tamil Nadu Board Class 12 board exam.
How should I revise Metallurgy for the Tamil Nadu Board Class 12 board exam?
Learn the core ideas first, then work through the 45 practice questions on Metallurgy. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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