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The net ionic equation for the reaction, if any, when aqueous solutions of CuCl2 and Na2S are mixed is: a) Na2S + Cu2+ = CuS + 2Na+ b) CuCl2 + S2- = CuS + 2Cl- c) Cu2+ + S2- = CuS d) Na2S + CuCl2 = CuS + 2NaCl e) Cu + S = CuS