Question

Observe double dispiacement reactions given in the text book and write down the similarities.​

Answer 1

Explanation:

Double displacement reactions are those in which ions of the reactants are exchanged to form new compounds as products. 

In option (ii), 

Na+ion combines with Cl− ion and SO42− ion combines with Ba2+ ion to form two new compounds as sodium chloride (NaCl) and barium sulphate (BaSO4) respectively.