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Lesson
Metals and Non-metals — Complete Lesson
?? Physical Properties of Metals vs Non-metals
| Property | Metals | Non-metals |
|---|---|---|
| Lustre | Shiny ? | Dull (except iodine, diamond) |
| Hardness | Hard (except Na, K) | Soft (except diamond) |
| Malleability | Can be beaten into sheets | Brittle |
| Conductivity | Good conductors | Poor (except graphite) |
| State | Solid (except mercury) | Solid/Liquid/Gas |
?? Bollywood Analogy: Metals are like Bollywood superstars — shiny, tough, conduct (energy to audiences), and can be shaped into any role. Non-metals are like indie artists — varied, unique, sometimes brittle but include diamonds (the most precious)!
? Reactivity Series
Metals arranged in decreasing order of reactivity:
K > Na > Ca > Mg > Al > Zn > Fe > Ni > Sn > Pb > [H] > Cu > Hg > Ag > Au > Pt
?? Extraction of Metals
- Low reactivity (Cu, Ag): Roasting/reduction with heat
- Medium reactivity (Fe, Zn): Reduction with carbon (coke)
- High reactivity (Na, K, Al): Electrolytic reduction
??? Corrosion and Prevention
Corrosion: Metals slowly get eaten away by air, moisture, and acids. Iron rusting (Fe2O3) is the most common example.
Prevention: Painting, oiling, galvanising (zinc coating), alloying, electroplating.
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MCQ Practice
Metals and Non-metals — MCQ Practice
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