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(A) The strength of a reducing agent is determined by its ability to lose electrons,which is measured by its standard oxidation potential. Greater the

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$Rb$

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(A) The strength of a reducing agent is determined by its ability to lose electrons,which is measured by its standard oxidation potential. Greater the negative value of standard reduction potential $(E^{\circ}_{red})$,the stronger is the reducing agent. Among the given elements,alkali metals ($Rb$ and $Na$) have more negative reduction potentials than alkaline earth metals ($Sr$ and $Mg$). Within the alkali metal group,the reduction potential becomes more negative down the group as the ionization energy decreases. Therefore,$Rb$ has the most negative standard reduction potential,making it the strongest reducing agent among the options provided.

As per standard reduction potential values,which is the strongest reducing agent among the given elements?

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