In graphite, each carbon is sp² hybridized and bonded to three others, leaving one p-orbital electron delocalized across the layer. These free electrons allow conduction parallel to layers.
Explanation:
Froth flotation is used for sulphide ores (ZnS, PbS, CuFeS₂). Ore particles adhere to oil froth and float, gangue sinks. Magnetic separation for magnetic ores. Calcination and smelting are extraction steps, not concentration.
Explanation:
Silver (Ag) is a noble metal below hydrogen in the reactivity series and does not displace H₂ from dilute acids. Mg, Al, Fe are above H and react: Mg + 2HCl → MgCl₂ + H₂. However, Al reacts slowly initially due to oxide layer. Copper also doesn't react. The reactivity series determines acid reactivity.
Explanation:
The Wurtz reaction involves the reaction of an alkyl halide with sodium metal in dry ether to form a higher alkane. For example, two molecules of methyl chloride react with two sodium atoms to form ethane (C2H6) and sodium chloride. It is primarily used to synthesize symmetrical alkanes with an even number of carbon atoms.
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