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D hydrogenation of alkenes 19 The gaseous products of heating a mixture of Ca(OH)2 and NH4Cl are passed through solid CaO. This absorbs water vapour and a gas, W, is collected. NH A sample of W is oxidised by Cl2(g) to produce two gases, X and Y. X is an element. Y is acidic. Y reacts with W to produce Z. CaCOH)2 + Nay ce What are X and Z? z - Cacle NHU 1013 CaCl2 NH4CX CaCl2 NH4C1 CaCOH) + NHvce NH+ salt + H20

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