Tiến hành các thí nghiệm sau: (a) Sục khí CO2 (dư) vào dung

Chọn D.

(a) CO₂ dư $+Ca{\left(OH\right)}_2\to Ca{\left(HC{O}_3\right)}_2$

(b) $N{H}_3+H_{2}O+A{l}_2{\left(S{O}_4\right)}_3\to Al{\left(OH\right)}_3+{\left(N{H}_4\right)}_{2}S{O}_4$

(c) $Ba{\left(OH\right)}_2$ dư + $A{l}_2{\left(S{O}_4\right)}_3\to BaS{O}_4+Ba{\left(Al{O}_2\right)}_2+H_{2}O$

(d) $NaOH+Ca{\left(HC{O}_3\right)}_2$ dư $\to CaC{O}_3+NaHC{O}_3+H_{2}O$

(e) $F{e}^{2+}+H^{+}+N{O}_3^{-}\to F{e}^{3+}+NO+H_{2}O$