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Heated (d) Melting of candle wax on heating5. The chemical reaction between quick lime and water is characterised by:(a) evolution of hydrogen gas.(b) formation ofslaked lime precipitate.(C) change in temperature of mixture. d) change in colour of the product. |
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Answer» The formation of slaked lime (CALCIUM hydroxide, Ca(OH)2) when water is added to lime (CaO) is exothermic. CaO(s) + H2O (l) → Ca(OH)2(s) This reaction occurs when water is added to dry portland cement to make concrete, and heat EVOLUTION of energy as heat is EVIDENT because the MIXTURE becomes warm. |
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