. BaCl2(aq) Na2SO4(aq) BaSO4(s) 2NaCl (aq) Above reaction involves which type of reaction

Best Answer

Explanation :

A reaction in which more reactive element displaces less reactive element is known as displacement reaction.

While a  reaction in which mutual exchange of ions or molecules takes place in between compounds is known as Double displacement reaction.

BaCl₂(aq) + Na₂SO₄(aq)→ BaSO₄₍s) + 2NaCl (aq)

Here ions  are  mutually exchanged  by each other so it is a double displacement reaction.

Also this reaction leads to the formation of white precipitate BaSO₄ So it is also a precipitation reaction. 

Final Answer : Hence the correct answer is (D) (b) & (d).