Question

CaCO3=CO2=H2CO3=MgCO3=Mg(HCO3)2=MgCO3=CO2=C

Answer 1

CaCO₃→CO₂→H₂CO₃→MgCO₃→Mg(HCO₃)₂→MgCO₃→CO₂→C

CaCO₃=CO₂+CaO

CO₂+H₂O=H₂CO₃

H₂CO₃+Mg=MgCO₃+H₂

MgCO₃+H₂O+CO₂→Mg(HCO₃)₂

Mg(HCO₃)₂(t⁰C)→MgCO₃+H₂O+CO₂

MgCO₃=CO₂+MgO

3CO₂+2Ba=2BaCO₃+C