C-07-Q084mediumsingle_mcqIn Na2SO4+BaCl2→BaSO4↓+2NaCl\mathrm{Na_2SO_4 + BaCl_2 \to BaSO_4{\downarrow} + 2NaCl}Na2SO4+BaCl2→BaSO4↓+, the precipitate is—aNaCl\mathrm{NaCl}NaClbBaSO4\mathrm{BaSO_4}BaSO4c