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The steps of producing sodium carbonate are as follows.

(1) NH3 + H2O + CO2 → NH4HCO3

(2) NH4HCO3 + NaCl → NH4Cl + NaHCO3

(3) 2NaHCO3 → Na2CO3 + CO2 + H2O

Which types of reactions are involved in the steps?

Combustion Reaction

Double displacement

Single displacement