C-12-Q022mediumsingle_mcqIn baking soda preparation, the first compound formed when CO2,NH3,H2O\mathrm{CO_2, NH_3, H_2O}CO2,NH3,H2O react is—aNa2CO3\mathrm{Na_2CO_3}Na2CO3bNH4HCO3\mathrm{NH_4HCO_3}NH4HCO3cNaHCO3\mathrm{NaHCO_3}NaHCO3dNH4Cl\mathrm{NH_4Cl}NH4Cl