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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)_(2)`
`CuCO_(3).Cu(OH)_(2) overset (Delta) rarr 2CuO + CO_(2) uarr + H_(2) O`
`CuO` is the black solid.
`CuCO_(3).Cu(OH)_(2) overset(Dil.HCl) rarr CuCl_(2) + CO_(2)+H_(2)O`
`CuCl_(2) overset(KI) rarr Cu_(2)I_(2) +KCl + I_(2)`
`A_(2)` is copper glance, `Cu_(2)S`, sulphide ore.
`Cu_(2)S overset(O_(2).Delta) rarr Cu_(2)O +SO_(2)`
`Cu_(2)S +Cu_(2)O rarrCu +SO_(2)`
The gas `SO_(2)` gives green colour with acidified `K_(2)Cr_(2)O_(7)`.
`K_(2)Cr_(2)O_(7)+H_(2)SO_(4)+3SO_(2)rarrK_(2)SO_(4) + underset("Green")(Cr_(2))(SO_(4))_(3) + 4H_(2)O`.
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