(a) Metal X is Copper (Cu) which is red-brown in colour and does not react with dilute acids.
(b) Colorless gas Y2 is Hydrogen (H2).
(c) Compound XO, a black metal compound is a Copper oxide (CuO)
(d) Water (H2O) is the product formed Y2O.
(e) Chemical equation for the reaction involved is:
CuO + H2 →Cu + H2O
(f) Displacement reaction (which is also a redox reaction).Which one active element displaces a less reactive element from its salt solution