Simple reaction questions

1)
K2SO3(aq) reacts with HCl(aq) to give potassium chloride solution, water and sulphur dioxide gas. K2SO3(aq) does not react with NaOH(aq).
K2SO3(aq) + 2HCl(aq) → 2KCl(aq) + H2O(l) + SO2(g)
or: SO3^2-(aq) + 2H^+(aq) → H2O(l) + SO2(g)

2)
FeSO4(aq) does not react with HCl(aq). FeSO4(aq) reacts with NaOH(aq) to give iron(II) hydroxide precipitate and sodium sulphate solution.
FeSO4(aq) + 2NaOH(aq) → Fe(OH)2(s) + Na2SO4(aq)

3)
(NH4)2CO3(aq) reacts with HCl(aq) to give ammonium chloride solution, water and carbon dioxide gas.
(NH4)2CO3(aq) + 2HCl(aq) → 2NH4Cl(aq) + H2O(l) + CO2(g)
or: CO3^2-(aq) + 2H^+(aq) → H2O(l) + CO2(g)
(NH4)2CO3(aq) reacts with NaOH(aq) to give sodium carbonate solution, water and ammonia gas.
(NH4)2CO3(aq) + 2NaOH(aq) → Na2CO3(aq) + 2H2O(l) + 2NH3(g)
or: NH4^+(aq) + 2OH^-(aq) → NH3(g) + H2O(l)