Question

Formula of calcium carbonate

Answer 1

formula of calcium carbonate is CaCO3
reaction: CaO + CO2 -----------> CaCO3
calcium oxide + carbon dioxide ---------> calcium carbonate
it is an exothermic reaction i.e., heat is liberated during this reaction

Answer 2

Formula of calcium carbonate is CaCO₃ .
It is formed by three main element calcium , carbon and oxygen.
Appearance is fine powdery with chalky taste.
Preparation :
CaO + H₂O  -----------------> Ca(OH)₂
Ca(OH)₂ + CO₂ --------------> CaCO₃ + H₂O