In a double displacement reaction such as the reaction between sodium sulphate solution and barium chloride solution:
(i) exchange of atoms takes place
(ii) exchange of ions takes place
(iii) a precipitate is produced
(iv) an insoluble salt is produced The correct option is:
(a) (ii) and (iv)
(b) (i) and (iii)
(C) only (ii)
(d) (ii), (iii) and (iv)​