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Quick Revision Table
| Concept | Key Fact | RPSC Relevance |
|---|---|---|
| Atomic Number | = number of protons (Z); identifies element | Atomic structure 2-mark |
| Isotopes | Same Z, different A | C-14 dating, I-131 therapy |
| Metals vs Non-metals | Metals lose electrons; non-metals gain | Properties, exceptions (Hg, graphite) |
| Bauxite | Ore of Al; India 5th global reserves | Rajasthan mineral — copper at Khetri |
| Stainless Steel | Fe + Cr (10–11%) + Ni | Alloy composition 2-mark |
| Brass | Cu + Zn | Alloy composition 2-mark |
| Duralumin | Al + Cu + Mg + Mn — aircraft alloy | Alloy uses 5-mark |
| pH Scale | 0–14; blood 7.35–7.45; stomach 1.5–2 | pH values in body — 5-mark |
| Penicillin | Alexander Fleming, 1928; first antibiotic | Drug classification 2/5-mark |
| DDT | Organochlorine; banned (agriculture) 1989 India | Pesticide, biomagnification |
| Stockholm Convention | 2004; bans 12 POPs including DDT | Environmental chemistry |
| Vulcanisation | Goodyear 1839; rubber + sulphur → cross-links | Carbon compounds 5-mark |
| Nuclear fission | U-235; ~200 MeV; chain reaction | Radioactivity 5/10-mark |
| Green chemistry | Anastas & Warner 1998; 12 principles | Green chemistry — new PYQ |
| Green H₂ Mission | Jan 2023; Rs 19,744 crore; 5 MMT by 2030 | Current affairs link |