C => CO2 => H2CO3 => CaCO3 =>CO2

Question

C => CO2 => H2CO3 => CaCO3 =>CO2

Answer 1

1) C+O2=>CO2;
2) CO2+H2O=>H2CO3;
3) H2CO3+CaCl2=>CaCO3+2HCl;
4) CaCO3+HCl=>CaCl2+H2O+CO2;