Option C — Both (i) and (ii) are double displacement reactions and precipitation reactions, as ions are exchanged and insoluble precipitates AgCl and BaSO₄ are formed respectively.
Source: Chapter 1, Section 1.2.4 Double Displacement Reaction
---
In both reactions, two compounds exchange their ions (double displacement). Both also produce an insoluble precipitate (AgCl↓ and BaSO₄↓), making them precipitation reactions too. Neither is a simple displacement (where one element replaces another). Examiners expect students to correctly identify both types simultaneously.