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A(1) and A(2) are two ores of metal M.A(...

`A_(1)` and `A_(2)` are two ores of metal `M.A_(1)` on calcination gives a black precipitate, `CO_(2)` and water. Identify `A_(1)` and `A_(2)`.
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`A_1` is malachite `CuCO_3.Cu(OH)_3`
`CuCO_3Cu(OH)_2overset(Delta)toCuO+CO_2uarr+H_2O`
`CuO` is the black solid.
`CuCO_3.Cu(OH)_2overset(dil.HCl)toCuCl_2+CO_2+H_2O`
`CuCl_2overset(KI)toCu_2I_2+KCl+I_2`
`A_2` is copper glance `Cu_2S`, a sulphide ore.
`Cu_2Sunderset(Delta)overset(O_2)toCu_2O+SO_2`
`Cu_2S+Cu_2OtoCu+SO_2`
The gas `SO_2` gives green colour with acidified `K_2Cr_2O_7.K_2Cr_2O_7+H_2SO_4+3SO_4toK_2SO_4+Cr_2(SO_4)_3+4H_2O`
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