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when 0.1M solutions of the following substances are mixed, which pair will precipitate?

1) Pb(CH3COO)2 and Mg(NO3)2
2) H2SO4 and KOH
3) ((NH4)2)CO3 and Na3PO4
4) NaOH and BaCl2
5) CaCl2 and Na2CO3

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