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Based on the data given below, the corre...

Based on the data given below, the correcy order of reducing power is:
`Fe_((aq.))^(3+) + e rarr Fe_((aq.))^(2+), E^(@) = +0.77 V`
`Al_((aq.))^(3+) + 3e rarr Al_((s)), E^(@) = -1.66 V`
`Br_(2(aq.)) + 2e rarr 2Br_((aq.))^(-), E^(@) = +1.08 V`

A

`Br^(-) lt Fe^(2+) lt Al`

B

`Fe^(2+) lt Al lt Br^(-)`

C

`Al lt Br^(-) lt Fe^(2+)`

D

`Al lt Fe^(2+) lt Br^(-)`

Text Solution

Verified by Experts

The correct Answer is:
A
(a) Electrode potentials in this case are standard oxidation potentials. The standard reduction potentials have opposite signs i.e.
`Fe^(2+)(aq) to Fe^(3+)(aq)+e^(-),E^(@)=-0.77" V "`
`Al(s) to Al^(3+)(aq)+3e^(-),E^(@)=+1.66" V "`
`2Br^(-)(aq) to Br_(2)(aq)+2e^(-),E^(@)=-1.08" V "`
Reducing power is in the order :
`Br^(-) lt Fe^(2+) lt Al`.
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