If cadmium metal and the Fe(III) ion are mixed in aqueous solution, a solution c

Question

If cadmium metal and the Fe(III) ion are mixed in aqueous solution, a solution containing Cd(II) and Fe(II) results. The balanced equation for this process is

a. Cd(s) + Fe3+(aq) ? Fe2+(aq) + Cd2+(aq).
b. Cd(s) + 2 Fe3+(aq) ? 2 Fe2+(aq) + Cd2+(aq).
c. 2 Cd(s) + Fe3+(aq) ? Fe2+(aq) + 2 Cd2+(aq).
d. 2 Cd(s) + Fe3+(aq) ? 2 Fe2+(aq) + Cd2+(aq).
e. 2 Cd(s) + Fe3+(aq) ? Fe2+(aq) + 2 Cd2+(aq).

Please explain

Explanation / Answer

b. Cd(s) + 2 Fe3+(aq) ==> 2Fe2+(aq) + Cd2+(aq). Cd will be oxidised to Cd2+ and Fe3+ will be reduced to Fe2+ depending on their reduction potential. In this equation, the charges are also balanced on both the sided.

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