Task: Text Categorization
Input (English): Question: Among the partial reactions that lead to sodium carbonate by the Solvay Process, are: 
 Options:  <0> The reaction between calcium carbonate and sodium chloride. <1> The precipitation of sodium hydrogen carbonate. <2> The thermal decomposition of ammonium chloride. <3> The formation of CaCO3 from CaO and CO2. <4> The reaction of ammonia with calcium oxide.
Output (English): chemistry