Which of the following reactions can take place at a cathode?

Question

Which of the following reactions can take place at a cathode?

a) Fe^+3 --> Fe^+2
b) Cu^+1 --> Cu^+2
c) H2 --> 2 H+
d) Ag --> Ag^+2

Please explain your answer. Thanks!

Answer 1

the option a is correct
because at cathode the metal reduces and at anode metal gets oxidised.so at cathode fe atom has reduced from +3 oxidation state to +2 oxdn state.always remember at cathode reduction takes place and at anode oxidation takes place.

Answer 2

At the cathode, electrons are being injected into the system, and as a result, you always have reductions.

a) Fe(+3) + 1e(-1) -> Fe(+2)
b) Cu(+1) -> Cu(+2) + 1e(-1)
c) H2 -> 2H(+1) + 2e(-1)
d) Ag -> Ag(+2) + 2e(-1)

As you can see from the full equations, a) is the only one that adds an electron to your starting material.

Answer 3

Only a. Reductions occur at the cathode; the others are oxidations and would occur at the anode.

Answer 4

Cathode: The electrode where reduction (gain of electrons) takes place. When discharging, it is the positive electrode, when charging, it becomes the negative electrode