已知反应6Fe
2++Cr
2O
72-+ 14H
+= 6Fe
3++ 2Cr
3++ 7H
2O在常温下可自发进行,则该反应组成的原电池的符号为()
A.(−)Fe(s)│Fe2+(c1), Fe3+(c2)║Cr2O72-(c3), Cr3+(c4), H+(c5)│Pt(s)(+)
B.(−)Fe2+(c1), Fe3+(c2)║Cr2O72-(c3), Cr3+(c4), H+(c5)│Pt(s)(+)
C.(−)Pt(s)│Cr2O72-(c3), Cr3+(c4),H+(c5)║Fe3+(c2),Fe2+(c1)│Pt(s)(+)
D.(−)Pt(s)│Fe2+(c1), Fe3+(c2)║Cr2O72-(c3), Cr3+(c4),H+(c5)│Pt(s)(+)