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Q.8.State what happens when:(1) Hydrated copper sulphate is heated.(ii) Gypsum is heated at 373 K.(iii) Chlorine gas is passed through dryslaked lime.Also write the chemical equation ineach case. |
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Answer» b)On heating gypsum at 373 K, it loses watermolecules and becomes calcium sulphatehemihydrate ( CaSO4. 1/2 H2O). This is calledPlaster of Paris.c) When chlorine is pased through dry slakedlime Ca(OH)2 , bleaching powder is obtained .Ca(OH)2 + Cl2 ---------> CaOCl2 + H2OSlaked lime Chlorine Bleaching powder (a) Hydrated CuSO₄ is heated :-When CuSO₄.5H₂O ( Hydrated copper sulphate) , contains 5 molecules of water of crystallisation.Salts containing water of crystallisation are called hydrated salts. When the hydrated salt (CuSO₄.5H₂O) is heated, it loses its water of crystallisation and becomes anhydrous salts (without water of crystallisation).The blue colour of CuSO₄ is due to the presence of water of crystallisation. Hence, when it loses its water of crystallisation, the solution becomes colourless. Where is the part 1 answer. Please tell that also! I have given the solution of 1st part Thank you so much |
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