Question

[Nguyễn Hoàng Nam]

Cho các phản ứng sau :

(1) 2Fe +  $3I_2\to 2FeC{l}_3$

(2)  $3F{e}_{\left(dư\right)}+8HN{O}_{3\left(loãng\right)}\to 3Fe{\left(N{O}_3\right)}_2+2NO+4H_{2}O$

(3)  $AgN{O}_3+Fe{\left(N{O}_3\right)}_2\to Fe{\left(N{O}_3\right)}_3+Ag$

  $$\begin{gathered} \left(4\right) Mg{\left(HC{O}_3\right)}_2+2Ca{\left(OH\right)}_{2\left(dư\right)} \\ \to 2CaC{O}_3+Mg{\left(OH\right)}_2+2H_{2}O \end{gathered}$$

(5) $2AlC{l}_3+3N{a}_{2}C{O}_3\to A{l}_2{\left(C{O}_3\right)}_3+6NaCl$

(6)  $FeO+2HN{O}_{3\left(l\right)}\to Fe{\left(N{O}_3\right)}_2+H_{2}O$

(7)  $NaHC{O}_3+Ca{\left(OH\right)}_2\stackrel{1:1}{\to }CaC{O}_3+NaOH+H_{2}O$

Những phản ứng đúng là :

A.  (2), (3), (5), (7).

B.  (1), (2), (3), (4), (7).

C. (2), (3), (4), (7).

D. (1), (2), (4), (6), (7).

Answer 1

[Ngô Quang Sinh]

Chọn C