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Question

Given :
Fe2+(aq)+2eFe(s); E=0.44V
Al3++3eAl(s); E=1.66V
Br2+2e2Br(aq); E=1.08V
The decreasing order of reducing power is:

A
Fe>Al>Br
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B
Al>Fe>Br
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C
Br>Fe>Al
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D
Fe>Br>Al
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Solution

The correct option is D Al>Fe>Br
(Al>Fe>Br)
More the oxidation potential, more the reducing power.
Eoxid(Al|Al3+)(+1.66C)>Eoxid(Fe|Fe2+)(0.044V)>Eoxid(2Br|Br2)(1.08V)
hence, the decreasing order of reducing power Al>Fe>Br

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