Question

A reddish-brown vessel developed a green coloured solid X when left open in the air for a long time. When reacted with dil H2SO4.It forms a blue coloured 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. & Z.
Write all the reactions involved.

Answer 1

Answer:

X is most likely copper (II) carbonate. This compound forms on copper where there is sufficient water vapor in the air. The green patina is why the Statue of Liberty does not look like copper. When copper (II) carbonate reacts with sulfuric acid the products are copper (II) oxide, carbon dioxide, and water.

Answer 2

CuCO3•Cu(OH)2 is the green colored compound,it forms when copper reacts with moisture

Z is CO2 which is a colorless and odourless gas

Y is CuO which is a black metal oxide