Question

The electronic configuration of metal A is 2, 8, 18, 1. The metal A when exposed to air and moisture forms B a green layered compound. A with con. H₂SO₄ forms C and D along with water. D is a gaseous compound. Find A, B, C and D.

Answer 1

Metal (A) with electronic configuration- 2, 8, 18, 1 is copper.

2Cu + O₂ + CO₂ + H₂O → CuCO₃ . Cu(OH)₂ (B)

Copper carbonate (Green layer)

(A) – Copper (Cu) 

(B) – Copper Carbonate (CuCO₃ . Cu(OH)₂) 

(C) – Copper Sulphate (CuSO₄)

(D) – Sulphur dioxide (SO₂)