Chọn phương án đúng: Sơ đồ các pin hoạt động trên cơ sở các phản ứng oxy hóa khử:

3Cl$_{2}$ + I$^{– }$+ 6OH$^{–}$ = 6Cl$^{–}$ + (IO_3^ -) + 3H$_{2}$O

(ClO_3^ -) + 3MnO$_{2}$ + 6OH$^{–}$ ® 3 (MnO_4^{2 – }) + Cl$^{–}$ (dd) + 3H$_{2}$O

A. (begin{array}{l}

left( – right)Ptleft| {C{l_2}} right|left. {2C{l^ – }} right|left| {{I^ – },IO_3^ – ,O{H^ – }} right|Ptleft( + right)\

left( – right)Ptleft| {Mn{O_2}} right|left. {MnO_4^{2 – },O{H^ – }} right|left| {ClO_3^ – ,C{l^ – },O{H^ – }} right|Ptleft( + right)

end{array})

B. (begin{array}{l}

left( – right)Ptleft| {C{l_2}} right|left. {2C{l^ – }} right|left| {{I^ – },IO_3^ – ,O{H^ – }} right|Ptleft( + right)\

left( – right)Ptleft| {Mn{O_2}} right|left. {MnO_4^{2 – },O{H^ – }} right|left| {ClO_3^ – ,C{l^ – },O{H^ – }} right|Ptleft( + right)

end{array})

C. (begin{array}{l}

left( – right)Ptleft| {{I^ – },IO_3^ – ,O{H^ – }} right|left| {2C{l^ – }} right|left. {C{l_2}} right|Ptleft( + right)\

left( – right)Ptleft| {Mn{O_2}} right|left. {MnO_4^{2 – },O{H^ – }} right|left| {ClO_3^ – ,C{l^ – },O{H^ – }} right|Ptleft( + right)

end{array})

D. (begin{array}{l}

left( – right)Ptleft| {C{l_2}} right|left. {2C{l^ – }} right|left| {{I^ – },IO_3^ – ,O{H^ – }} right|Ptleft( + right)\

left( – right)Ptleft| {ClO_3^ – ,C{l^ – },O{H^ – }} right|left| {MnO_4^{2 – },O{H^ – }} right|left. {Mn{O_2}} right|Ptleft( + right)

end{array})

Hướng dẫn

Chọn C là đáp án đúng