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please need help 2. Based on selective precipitation, identify the order in which the following ions CO32,SO42 and Cl has to be added in a

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2. Based on selective precipitation, identify the order in which the following ions CO32,SO42 and Cl has to be added in a way to separate Pb2+,Fe3+ and Hg22+ : a) CO32,SO42,Cl b) SO42,CO32,Cl c) SO42,Cl,CO32+ d) Cl,SO422,CO32 e) None of the above could work for selective precipitation

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