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. H2 SO4 forms C and D along with water. D is a gaseous compound. Find A, B, C, and D.

Answer 1

(i) The electronic configuration of metal (A) is 2, 8, 18, 1. A is copper (Z = 29)

(ii) (A) Copper exposed to air and moisture forms a green layered compound (B) that is copper carbonate.

\[\ce{\underset{\text{(A)}}{2Cu} + O2 + CO2 + H2O-> CuCO3.\underset{\text{(B)}}{Cu(OH)2}}\]

(iii) Copper (A) reacts with conc.H₂SO₄ to give copper sulphate (C) and Sulphur dioxide (D).

\[\ce{\underset{\text{(A)}}{Cu} + conc.2H2SO4->\underset{\text{(C)}}{CuSO4} + \underset{\text{(D)}}{SO2↑} + 2H2O}\]

A	Copper	Cu
B	Copper carbonate	\[\ce{CuCO3.Cu(OH)2}\]
C	Copper sulphate	CuSO4
D	Sulphur dioxide	SO2