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An orange solid. 'X' on heating givés a ...

An orange solid. 'X' on heating givés a green rešidue 'Y', water vapours and a colourless gas Z. The gas 'Z' in dry conditions is passed over heated 'Mg' to give à solid 'W' which further reacts, with water to produce gas E which gives dense white fumes with HCl. Identify 'X, Y_ Z W. E

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X-NH_4, Cr_2 O_r^+, Y-Cr_2 O_y dot Z-N_underline2, ~W_- Mg_x ~N_2 E- NH_4 , dense white fumes -NH, Cl
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