Solution:
( 1) It forms trioxocarbonate iv acid when dissolved in water; C02 (g) +H2O (l) → H2CO3 (aq)
(2) It reacts with an alkali to form a trioxocarbonate v salt and water.
 e.g (i) 2NaOH+CO2 → Na2CO3 +H2O
 (ii) Ca(OH)2 + CO2 → CaCO3 +H2O
(3) Hot magnesium burns in CO2 to form carbon and oxide of magnesium.
CO2 +2Mg → 2MgO + C
4. Red hot carbon burn in CO2 to form carbon ii oxide
CO2 +C → 2CO
USES
1. Used as fire extinguisher
2. Used to manufacture washing soda in solvary process
3. To manufacture urea and fertilizers.
4. in the manufacture of aerated (soft or mineral) drinks.
5. in the manufacture of health salts.
6. As refrigerant for fruit, ice cream and other perishable goods
7. As coolant in nuclear reactors.
