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Which of the following is the weakest reducing agent

$(a)\;Zn\qquad(b)\;H_2\qquad(c)\;Cu\qquad(d)\;Li$

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Cu as it comes after H in electrochemical series. It has positive standard reduction potential thus does not provide electrons for reduction.
Hence (c) is the correct answer.
answered Jan 30, 2014 by sreemathi.v
 
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