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Câu hỏi: Từ các sơ đồ phản ứng sau (theo đúng tỉ lệ mol):
$2{{\text{X}}_{1}}+2{{X}_{2}}\xrightarrow{{}}2{{\text{X}}_{3}}+{{H}_{2}}$ ${{X}_{3}}+C{{O}_{2}}\xrightarrow{{}}{{X}_{4}}$
${{X}_{3}}+{{X}_{4}}\xrightarrow{{}}{{X}_{5}}+{{X}_{2}}$ $2{{\text{X}}_{6}}+3{{\text{X}}_{5}}+3{{\text{X}}_{2}}\xrightarrow{{}}2F\text{e}{{\left( OH \right)}_{3}}+3C{{O}_{2}}+6KCl$
Các chất thích hợp tương ứng với X3, X5, X6 lần lượt là:
A. KHCO3, K2CO3, FeCl3.
B. KOH, K2CO3, Fe2(SO4)3.
C. KOH, K2CO3, FeCl3.
D. NaOH, Na2CO3, FeCl3.
$2{{\text{X}}_{1}}+2{{X}_{2}}\xrightarrow{{}}2{{\text{X}}_{3}}+{{H}_{2}}$ ${{X}_{3}}+C{{O}_{2}}\xrightarrow{{}}{{X}_{4}}$
${{X}_{3}}+{{X}_{4}}\xrightarrow{{}}{{X}_{5}}+{{X}_{2}}$ $2{{\text{X}}_{6}}+3{{\text{X}}_{5}}+3{{\text{X}}_{2}}\xrightarrow{{}}2F\text{e}{{\left( OH \right)}_{3}}+3C{{O}_{2}}+6KCl$
Các chất thích hợp tương ứng với X3, X5, X6 lần lượt là:
A. KHCO3, K2CO3, FeCl3.
B. KOH, K2CO3, Fe2(SO4)3.
C. KOH, K2CO3, FeCl3.
D. NaOH, Na2CO3, FeCl3.
$2K\left( {{X}_{1}} \right)+2{{H}_{2}}O\left( {{X}_{2}} \right)\xrightarrow{{}}2KOH\left( {{X}_{3}} \right)+{{H}_{2}}$
$KOH\left( {{X}_{3}} \right)+C{{O}_{2}}\xrightarrow{{}}KHC{{O}_{3}}\left( {{X}_{4}} \right)$
$KOH\left( {{X}_{3}} \right)+KHC{{O}_{3}}\left( {{X}_{4}} \right)\xrightarrow{{}}{{K}_{2}}C{{O}_{3}}\left( {{X}_{5}} \right)+{{H}_{2}}O\left( {{X}_{2}} \right)$
$2FeC{{l}_{3}}\left( {{X}_{6}} \right)+3{{K}_{2}}C{{O}_{3}}\left( {{X}_{5}} \right)+3{{H}_{2}}O\left( {{X}_{2}} \right)\xrightarrow{{}}2Fe{{\left( OH \right)}_{3}}+3C{{O}_{2}}+6KCl$
$KOH\left( {{X}_{3}} \right)+C{{O}_{2}}\xrightarrow{{}}KHC{{O}_{3}}\left( {{X}_{4}} \right)$
$KOH\left( {{X}_{3}} \right)+KHC{{O}_{3}}\left( {{X}_{4}} \right)\xrightarrow{{}}{{K}_{2}}C{{O}_{3}}\left( {{X}_{5}} \right)+{{H}_{2}}O\left( {{X}_{2}} \right)$
$2FeC{{l}_{3}}\left( {{X}_{6}} \right)+3{{K}_{2}}C{{O}_{3}}\left( {{X}_{5}} \right)+3{{H}_{2}}O\left( {{X}_{2}} \right)\xrightarrow{{}}2Fe{{\left( OH \right)}_{3}}+3C{{O}_{2}}+6KCl$
Đáp án C.