Question

Which metal cation can oxidize Fe(s) to Fe2+(aq) (i.e. which metal cation is a stronger oxidizing...

Which metal cation can oxidize Fe(s) to Fe2+(aq) (i.e. which metal cation is a stronger oxidizing agent)?

(A) Al3+ (B) Ag+ (C) Mn2+ (D) Zn2+

Some relevant standard reduction potentials:

Ag+(aq) + e- → Ag (s) Eo= +0.80 V

Fe2+(aq) + 2e- → Fe (s)    Eo= -0.45 V

Zn2+(aq) + 2e- → Zn(s)    Eo= -0.76 V

Mn2+(aq) + 2e- → Mn (s)    Eo= - 1.18 V

Al3+(aq) + 3e- →Al(s) Eo= -1.66 V

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Homework Answers

Answer #1

answer : B) Ag+

explanation:

Fe2+(aq) + 2e- → Fe (s)    Eo= -0.45 V , here reduction potentail value is -0.45 V . the lower reduction potential than -0.45 V can act as strong reducing agents

Zn , Mn , Al can act as reducing agents these are stronger than Fe

and Ag+ can act as strong oxidizing it can oxidise all metal atoms given

so Ag+ is the strongest oxidizing agent

Al is the strongest reducing agent

reducing agent order : Al > Mn   > Zn > Fe > Ag

oxidizing agent order : Al3+ < Mn2+ < Zn2+ < Fe2+ < Ag+

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