Which of the following chemicals,in addition to water,are used for the manufacture of $Na_2CO_3$ by the Solvay process?
- A$NaCl, CO$ and $NH_3$
- B$NaCl, CO_2$ and $NH_3$
- C$NaCl, NH_4Cl$ and $CO_2$
- D$NaHCO_3, CO$ and $NH_3$
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