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The results of the qualitative analysis on a solution are given below. Use the results to state whether the following ions could be present in the solution. test (1): solution + 6 M HCl -> no precipitate test (2) ->: solution + H2S + 0.2 M HCl -> precipitate test (3): solution + (NH4)2S (pH 8) -> no precipitate test (4): solution + (NH4)2HPO4 + NH3 -> precipitate (a) Hg2Cl2 (b) Bi2S3 (c) Ni(OH)2 (d) Ba3(PO4)2