`A_1` and `A_2` are two ores of metal `M.A_1` on calcination gives bl – InterviewSolution

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1.	`A_1` and `A_2` are two ores of metal `M.A_1` on calcination gives black precipitate, `CO_2` and water. Identify `A_1` and `A_2`.
Answer» `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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