Hướng dẫn giải

- Chọn C.

- PTHH:          $KHC{{O}_{3}}$+  HCl$\xrightarrow{{}}$  KCl  +  $\text{C}{{\text{O}}_{2}}\uparrow $ +  ${{H}_{2}}O$

                        $N{{a}_{2}}C{{O}_{3}}$+  2HCl$\xrightarrow{{}}$  2NaCl  +  $\text{C}{{\text{O}}_{2}}\uparrow $ +  ${{H}_{2}}O$

$BaC{{O}_{3}}$+  2HCl$\xrightarrow{{}}$$BaC{{l}_{2}}$  +  $\text{C}{{\text{O}}_{2}}\uparrow $ +  ${{H}_{2}}O$

            $Ca{{(OH)}_{2}}$+  2HCl$\xrightarrow{{}}$$CaC{{l}_{2}}$   +  2${{H}_{2}}O$