A reddish brown developed a green colored solid x
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A reddish brown vessel developed a green coloured solid X when left open in air for a long time. When reacted with dilute H2SO4 it forms a blue coloured solution along with brisk effervescence due to colourless and odourless gas Z. X decomposes to form black coloured oxide Y of a reddish brown metal along with gas Z. Identify X, Y and Z.
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