Question

A reddish brown vessel developed a green colored solid 'x' when left to open air for long time. When reacted with dil H2SO4, it forms a blue color solution along brisk effervesance due to colorless and odourless gas 'z'. 'x' decomposes to form black colored oxide of 'y' of a reddish brown metal along with gas 'z'. Identify x, y, and z ?

Answer 1

x should be copper , thinking for y and z