Answer:
H2O + CO2 ⇌ H2CO3
Option 1
Explanation:
Decomposition for the carbonic acid produces water and carbon dioxide.
As this reaction is an equilibrium we can write in both senses:
For this case:
Reactants: Water and CO₂
Products: H₂CO₃
The reaction is: H₂O + CO₂ ⇄ H₂CO₃