What is produced during the replacement reaction of Ba(NO3)2 and Na2SO4?

In a double-replacement reaction, the positive ions switch partners: Ba²⁺ combines with SO₄²⁻ to form BaSO₄, and Na⁺ combines with NO₃⁻ to form NaNO₃. Balancing gives Ba(NO₃)₂ + Na₂SO₄ → 2NaNO₃ + BaSO₄. The products are 2NaNO₃ and BaSO₄, as shown in choice B.

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