identify strongest and weakest reducing agent zn,cu,na,agsn?? why

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Solution

Metals are good reducing agents because they can be oxidized easily. The reducing ability of the metal is given by the activity series. The more active metal is able to reduce the less active metal cation. This activity series is:
Li>K>Ca>Na>Mg>Al>Zn>Cr>Fe>Ni>Sn>Pb>H₂>Cu>Hg>Ag>Pt>Au
most active least active
Hence, Na is the strongest reducing agent and Ag is the weakest reducing agent among Zn, Cu, Na, Ag and Sn

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