You want to prepare barium sulfate, BaSO4, using n exchange reaction of some type. To do so you have the reagents shown from which the here from which to select the reactants Which two reagents coulde be used to form BaSO4 via an acid - base but not gas formiing reaction: here's the Reactants shown BaCL2, Ba(OH)2, Na2SO4, H2SO4, and BaCO3

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