$\mathrm{Ca(HCO_3)_2 + 2HCl \rightarrow CaCl_2 + 2H_2O + ?}$. The missing product is—

Question

Accepted Answer

$\mathrm{2CO_2}$

Answer

$\mathrm{2H_2}$

Answer

$\mathrm{O_2}$

Answer

$\mathrm{2NH_3}$

Ca(HCO3)2+2HCl→CaCl2+2H2O+?\mathrm{Ca(HCO_3)_2 + 2HCl \rightarrow CaCl_2 + 2H_2O + ?}Ca(HCO3​)2​+2HCl→CaCl2​+2H2​. The missing product is—