A. KOH (Potassium hydroxide) KOH is a strong base that absorbs carbon dioxide ( CO2 ) forming potassium carbonate. Use: Absorbent for CO2. ⟶A⟶IV B. Na(I) (Liquid sodium) Liquid sodium metal is used as a coolant in nuclear reactors because of its high thermal conductivity. Use: Coolant. ⟶B⟶I C. Li (Lithium) Lithium is used in electrochemical cells (batteries). Use: Electrochemical cells. ⟶C⟶III D. Mg(OH)2 (Magnesium hydroxide) Mg(OH)2 is a weak base, used as an antacid ("milk of magnesia"). Use: Antacid. ⟶D⟶II Therefore, correct matching is: A-IV, B-I, C-III, D-II
