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A few half - cell reactions and their st...

A few half - cell reactions and their standard reduction potentials are given belwo :
`Pb^(2+)+2e rarr Pb," "E^(@)=-0.126V," "Al^(3+)+3e rarrAl,`
`E^(@)=-1.66V`
`Zn^(2+)+2e rarr Zn, E^(@)=-0.76V`,
`Cd^(2+)+2e rarr Cd, E^(@)=-0.402V`
Arrange Zm Pb, Cd and Al in ascending order of their ability to act as reducing agent.

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