Question

a reddish brown vessel developed a graan coloured solid x when left open in air for a long time when react with H2SO4, it forms a blue coloured solution along with brisk effervescence due to colourless and odourless gas Z. X decomposes to form a black coloured oxide Y of a reddish brown metal along with gas Z identify X,Y,Z​

Answer 1

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Answer 2

Answer:

X is Copper Carbonate (CuCO3)

Y is Copper Oxide (CuO)

Z is Carbon dioxide (CO2)

Explanation:

When left in the open air for some time, a vessel of copper which is reddish brown in color combines with carbon dioxide and also the moisture in the environment to form a green coating. This green coating is copper carbonate (CuCO3) which is basic in nature.

On reacting with dilute H2SO4, copper carbonate forms a blue colored solution. This solution is that of copper sulphate (CuSO4) and a colorless and odorless gas which is carbon dioxide (CO2).

On decomposition, copper carbonate forms copper oxide (CuO) which is black in color. It also decomposes to form carbon dioxide.