Từ các sơ đồ phản ứng sau (theo đúng tỉ lệ mol): $\large \text{(1) 2}{

Từ các sơ đồ phản ứng sau (theo đúng tỉ lệ mol):

$\large \text{(1) 2}{{\text{X}}_{\text{1}}}\text{+ 2}{{\text{X}}_{\text{2}}}\text{ }\!\!~\!\!\text{ }\to \text{2}{{\text{X}}_{\text{3}}}\text{+ }{{\text{H}}_{\text{2}}}$                         

$\large \text{(2) }{{\text{X}}_{\text{3}}}\text{+ C}{{\text{O}}_{\text{2}}}\text{ }\!\!~\!\!\text{  }\!\!~\!\!\text{ }\to {{\text{X}}_{\text{4}}}$

$\large  \text{(3)}\,{{\text{X}}_{\text{3}}}\text{+ }{{\text{X}}_{\text{4}}}\text{ }\!\!~\!\!\text{ }\to {{\text{X}}_{\text{5}}}\text{+ }{{\text{X}}_{\text{2}}}$

$\large \text{(4)}\,\text{2}{{\text{X}}_{\text{6}}}\text{+ 3}{{\text{X}}_{\text{5}}}\text{ }\!\!~\!\!\text{ + 3}{{\text{X}}_{\text{2}}}\to \text{2Fe}{{\left( \text{OH} \right)}_{\text{3}}}\text{+ 3C}{{\text{O}}_{\text{2}}}\text{+ 6KCl}$

Các chất thích hợp tương ứng với $\large {{\text{X}}_{\text{3}}}\text{, }{{\text{X}}_{\text{5}}}\text{, }{{\text{X}}_{\text{6}}}\text{ }\!\!~\!\!\text{ }$ lần lượt là                                                        

 

• A. A. $\large \text{KHC}{{\text{O}}_{\text{3}}}\text{,}\,{{\text{K}}_{\text{2}}}\text{C}{{\text{O}}_{\text{3}}}\text{,}\,\text{FeC}{{\text{l}}_{\text{3}}}$. 
• B. B. $\large \text{KOH,}\,{{\text{K}}_{\text{2}}}\text{C}{{\text{O}}_{\text{3}}}\text{,}\,\text{F}{{\text{e}}_{\text{2}}}{{\text{(S}{{\text{O}}_{\text{4}}}\text{)}}_{\text{3}}}$.     
• C. C. $\large \text{KOH,}\,{{\text{K}}_{\text{2}}}\text{C}{{\text{O}}_{\text{3}}}\text{,}\,\text{FeC}{{\text{l}}_{\text{3}}}$. 
• D. D. $\large \text{NaOH,}\,\text{N}{{\text{a}}_{\text{2}}}\text{C}{{\text{O}}_{\text{3}}}\text{,}\,\text{FeC}{{\text{l}}_{\text{3}}}$.

$\large {{X}_{1}}:K;\,{{X}_{2}}:{{H}_{2}}O;\,{{X}_{3}}:K\text{O}H$

$\large {{X}_{4}}:KHC{{O}_{3}};\,{{X}_{5}}:\,{{K}_{2}}C{{O}_{3}};\,{{X}_{6}}:\,F\text{e}C{{l}_{3}}$

$\large 2K+2{{H}_{2}}O\to 2K\text{O}H+{{H}_{2}}$

$\large K\text{O}H+C{{O}_{2}}\to KHC{{O}_{3}}$

$\large K\text{O}H+KHC{{O}_{3}}\to {{K}_{2}}C{{O}_{3}}+{{H}_{2}}O$

$\large 2F\text{e}C{{l}_{3}}+3{{K}_{2}}C{{O}_{3}}+3{{H}_{2}}O\to 2F\text{e}{{(OH)}_{3}}+3C{{O}_{2}}+6KCl$