a reddish brown vessel developed a green coloured solid X when left open in air for a long time. when reacted with dillute sulphuric acid ,it forms a blue colored solution along with brisk effervescence due to colourless 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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it is copper
it is copperCu+H2SO4= CuSO4=H2
it is copperCu+H2SO4= CuSO4=H2so x is copper,y is copper oxide, z is hydrogen
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