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The electronic configuration of metal A ...

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 conc. `H_2SO_4` forms C and D along with water . D is a gaseous compound. Find A , B, C and D .

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Metal A is copper
`underset ("Copper") underset((A))(2Cu)+O_2+CO_2+H_2O to underset("Basic copper carbonate ")underset((B))(CuCO_3.Cu(OH)_2)`
`underset((A))(Cu)+underset("conc. sulphuric acid ")("conc."2H_2SO_4) to underset("Copper sulphate ")underset((C))(CuSO_4)+underset("Sulphur-di-oxide (gas)")underset((D))(SO_2 uarr) + H_2O`
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