LIST- I contains compounds and LIST- II contains reactions LIST- I LIST- II I H 2 O 2 P Mg HCO 3 2 + Ca OH 2 → II Mg OH 2 Q BaO 2 + H 2 SO 4 → III BaCl 2 R Ca OH 2 2 + MgCl 2 → IV CaCO 3 S BaO 2 + HCl → T Ca HCO 3 2 + Ca OH 2 → Match each compound in LIST- I with its formation reaction(s) in LIST- II , and choose the correct option
D. I → Q ; II → R ; III → S ; IV → P
In this method calculated amount of lime is added to hard water. It precipitates out calcium carbonate and magnesium hydroxide which can be filtered off P     Mg HCO 3 2 + 2 Ca OH 2 ⟶ 2 CaCO 3 ↓ + Mg OH 2 ↓ + 2 H 2 O T     Ca HCO 3 2 + Ca OH 2 ⟶ 2 CaCO 3 ↓ + 2 H 2 O R     Ca OH 2 + MgCl 2 ⟶ Mg OH 2 + CaCl 2 Acidifying barium peroxide and removing excess water by evaporation under reduced pressure gives hydrogen peroxide Q     BaO 2 + H 2 SO 4 ⟶ BaSO 4 + H 2 O 2 S     BaO 2 + 2 HCl ⟶ BaCl 2 + H 2 O 2 I → Q II → R III → S IV → P
Related: Chemistry — Hydrogen · All PYQ Banks