A) \[C{{l}^{-}}(aq)\xrightarrow{{}}\frac{1}{2}C{{l}_{2}}(g)+{{e}^{-}};\]\[E_{cell}^{{}^\circ }=1.36V\]
B) \[2{{H}_{2}}O(1)\xrightarrow{{}}{{O}_{2}}(g)+4{{H}^{+}}4{{e}^{-}};\]\[E_{cell}^{{}^\circ }=1.23V\]
C) \[N{{a}^{+}}(aq)+{{e}^{-}}\xrightarrow{{}}Na(s);\]\[E_{cell}^{{}^\circ }=2.71V\]
D) \[{{H}^{+}}(aq)+{{e}^{-}}\xrightarrow{{}}\frac{1}{2}{{H}_{2}}(g);\]\[E_{cell}^{{}^\circ }=0.00V\]
Correct Answer: A
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