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Standard electrode potential values, E^(...

Standard electrode potential values, `E^(theta)` for `Al^(3+)// Al` is - 1.66 V and that of `Tl^(3+)// Tl` is + 1.26 V. Predict about the formation of `M^(3+)` ion in solution and compare the electropositive.character of the two metals.

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Standard electrode potential values for two half cell reactions suggest that aluminium has high tendency to make `Al^(3+)` (aq) ions, whereas `Tl^(3+)` is not only unstable in solution but is a powerful oxidising agent also. Thus `Tl^(+)` is more stable in solution than `Tl^(3+)`. Aluminium being able to form +3 ions easily, is more electropositive than thallium.
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