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An element 'X' having green colour and w...

An element 'X' having green colour and with seven molecules of water of crystallisation was heated strongly to leave a solid residue "Y". This Y reacts with conc. nitric acid to form a nitrate 'Z'. This nitrate reacted with hydrochloric acid to form a chloride 'A'. When hydrogen sulphide was passed into Its aqueous solution a black compound B was precipitated. Identify X, Y, Z, A and B and also give the equation involved.

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