Chemistry Notes Ssc -

✅ Diamond (carbon) ✅ Liquid metal at room temp: Mercury (Hg) ✅ Liquid nonmetal at room temp: Bromine (Br) ✅ Lightest gas: Hydrogen ✅ Heaviest gas (natural): Radon (Rn) ✅ Most abundant gas in air: Nitrogen (78%) ✅ Most abundant element in earth’s crust: Oxygen (46%) ✅ Noble gas used in arc welding: Argon ✅ Gas in LPG: Butane + Propane ✅ Gas in CNG: Methane ✅ Gas in fire extinguisher: CO₂

Substances formed by the chemical combination of two or more elements in a fixed ratio (e.g., H2Ocap H sub 2 cap O CO2cap C cap O sub 2 Mixtures: Physical combinations of substances. chemistry notes ssc

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Learn about ores, alloys (like brass and bronze), and the reactivity series. ✅ Diamond (carbon) ✅ Liquid metal at room