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

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How would you account for the following: Cobalt(II) is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised.

Li is very strong reducing agent in aqueous solution because of -

How would you account for the following : Cobalt (II) is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised.

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How do you account of the reducing behaviour for H_(3)PO_(2) ?