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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.
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Solution
(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 |
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