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A reddish brown vessel developed a green colored solid X when left open for a long time.when reacted with dilute sulphuric acid,it forms a blue colored

soln along with brisk effervescence due to colorless & odourless gasZ.X decomposes to form black colored oxide Y of a reddish brown metal along with gas Z,Identify X,Y,Z.


X = CuCo3 , Cu(OH)2
Y = CuO
Z = Co2

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