How do you account for the strong reducing power of lithium in aqueous solution?

How do you account for the strong reducing power of lithium in aqueous solution?
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Answer :

Ans.Electrode potential is a measure of the tendency of an element to lose electrons in the aq.solution .It depends upon following factors :
(i)Sublimation enthalpy.
(II)Ionisation enthalpy
(iii)Hydration enthalpy
Since Li has the smallest size,Its enthalpy of hydration is the highest among alkali metals .Although ionization enthalpy of Li is the highest among alkali metals,it is more than compensated by the high High enthalpy of hydration.Thus Li has the most negative E0 Value and hence lithium is the strongest reducing agent.
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