Teacher:In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Teacher: Now, understand the problem? Solve this instance: Question: Among the partial reactions that lead to sodium carbonate by the Solvay Process, are:
Options: <1> The reaction between calcium carbonate and sodium chloride. <2> The precipitation of sodium hydrogen carbonate. <3> The thermal decomposition of ammonium chloride. <4> The formation of CaCO3 from CaO and CO2. <5> The reaction of ammonia with calcium oxide.
Student:
2