When aqueous barium chloride (BaCl₂) reacts with aqueous sodium sulphate (Na₂SO₄), a double displacement reaction occurs producing insoluble barium sulphate (BaSO₄) as a white precipitate and sodium chloride (NaCl) in the aqueous phase. The ionic equation shows Ba²⁺ combining with SO₄²⁻ to form BaSO₄(s), while Na⁺ and Cl⁻ remain dissolved as spectator ions producing NaCl(aq). Therefore the aqueous solution after reaction contains sodium chloride, and barium sulphate separates out as a solid under normal laboratory conditions at room. Correct option – D.