List the given metal ions in order of increasing strength as oxidizing agents, based on the following standard reduction potentials, e°red .
al3+ < fe2+ < zn2+ < ag+
zn2+ < fe2+ < ag+ < al3+
ag+ < fe2+ < zn2+ < al3+
al3+ < zn2+ < fe2+ < ag+

 Al3+ < Zn2+ < Fe2+ < Ag+

Explanation: Oxidizing Agents can be defined as those agents which oxidized the other species by getting itself reduced.

Standard Reduction potential is the tendency of the chemical species to get reduced and is also used to determine which is better oxidizing or a reducing agent.

The E°red of the following -

= -1.66V

= -.45V

=  -.76

 = +.80

Thus   is the best oxidizing agent among the given.

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