複選題

4. 下列反應中，何者為酸鹼中和反應？
(A) $\text{Pb}(\text{NO}3){2(\text{aq})} + 2\text{NaCl}{(\text{aq})} \longrightarrow 2\text{NaNO}{3(\text{aq})} + 2\text{PbCl}_{2(\text{s})}$
(B) $2\text{CH}3\text{COOH}{(\text{aq})} + \text{Ca}(\text{OH}){2(\text{aq})} \longrightarrow (\text{CH}3\text{COO})2\text{Ca}{(\text{aq})} + 2\text{H}2\text{O}{(\text{l})}$
(C) $\text{SO}{2(\text{g})} + 2\text{H}2\text{S}{(\text{g})} \longrightarrow 3\text{S}{(\text{s})} + 2\text{H}2\text{O}{(\text{l})}$
(D) $\text{H}3\text{PO}{4(\text{aq})} + 3\text{KOH}{(\text{aq})} \longrightarrow \text{K}3\text{PO}{4(\text{aq})} + 3\text{H}2\text{O}_{(\text{l})}$