A reddish brown coloured vessel developed a green solid x when left open in air for a long time .when reacted with dilute h2so4,it formed 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.identify x,y andz
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x is copper but I am not sure about y and z
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