1. (a) Name the raw materials used in the manufacture of sodium carbonate by the Solvay process.
(i) Salt, limestone, ammonia, and carbon dioxide.
(ii) Sodium chloride, limestone, ammonia, and carbon dioxide.
(iii) Sodium chloride, lime, ammonia, and carbon monoxide.
(iv) Sodium hydroxide, limestone, ammonia, and carbon dioxide.
(b) How is sodium hydrogen carbonate obtained from a mixture of (NH₄Cl) and (NaHCO₃)?
(i) By sublimation
(ii) By precipitation
(iii) By filtration
(iv) By recrystallization
