In the electrochemical voltaic cell using the reaction, Fe 3+ (aq) + Cr(s) Fe(s)
ID: 967799 • Letter: I
Question
In the electrochemical voltaic cell using the reaction, Fe3+(aq) + Cr(s) Fe(s) + Cr3+(aq), match the correct 1/2 reaction that occurs at the anode and cathode.
__. 1/2 reaction occuring at the anode
__. 1/2 Reaction occuring at the cathode
Fe(s) + 3e Fe3+(aq)
Fe3+(aq) + 3e Fe(s)
Cr3+(aq) + 3e Cr(s)
Cr(s) Cr3+(aq) + 3e
Fe3+(aq) Fe(s) + 3e
Cr(s) + 3e Cr3+(aq)
A.Fe(s) + 3e Fe3+(aq)
B.Fe3+(aq) + 3e Fe(s)
C.Cr3+(aq) + 3e Cr(s)
D.Cr(s) Cr3+(aq) + 3e
E.Fe3+(aq) Fe(s) + 3e
F.Cr(s) + 3e Cr3+(aq)
Explanation / Answer
Fe3+(aq) + Cr(s) Fe(s) + Cr3+(aq),
anode --> oxidation occurs here, loss oe electrons
so
Cr(s) --> Cr3+ + 3e-
cathode --> redutio occurs here, gain of electrons
Fe+3(aq) + 3e - ----> Fe(s)