Question

A less reactive metal X on reaction with oxygen forms a black coating. If this black coating
comes in full contact with gas Y, X is recovered. Identify X and Y. Also write the equations
involved.

Answer 1

Answer:

X- Copper

Y- Carbon (II) Oxide

Explanation:

Copper reacts with oxygen to form a black solid,Copper (II) oxide. 2Cu(s) + O2(g) 2CuO(s)

Upon reacting with Carbon (II) Oxide, Copper (II) oxide is reduced to Copper metal and Carbon (II) Oxide is oxidised to Carbon (IV) oxide gas.

CuO(s) + CO(g) Cu(s)+ CO2 (g)

Answer 2

The less reactive metal X is Copper (Cu) and the gas Y is Carbon Monoxide (CO).

- Copper on reaction with oxygen gas and forms a black solid of Copper (II) oxide as per the given reaction:

2 Cu (s) + O₂ (g) ---> 2 CuO (s)

- When this black coating  of Copper (II) oxide reacts with Carbon Monoxide, then it gets converted back to Copper metal and Carbon dioxide gas is formed along with it.

CuO (s) + CO (g) ---> Cu (s) + CO₂ (g)