Which is the strongest reducing agent among the following metals:-
A reducing agent reduces the element or compound that it reacts with and in the process, the reducing agent gets oxidized. Another way to look at this situation is to assess the ability or ease with which the given metals lose electrons - because the loss of electrons is by definition, an oxidation process. From the given metals, potassium has the maximum tendency to lose its electron and hence it is most reactive metal and no doubt, the strongest reducing agent as well.