The correct increasing order of reducing power of the metals is:

K+/K = –2.93 V
Ag+/Ag = 0.80 V
Hg2+/Hg = 0.79 V
Mg2+/Mg = –2.37 V
Cr3+/Cr = – 0.74 V
 
1. Cr<Mg<K<Ag<Hg 2. Mg<K<Ag<Hg<Cr
3. K<Ag<Hg<Cr<Mg 4. Ag<Hg<Cr<Mg<K

Subtopic:  Electrode & Electrode Potential |
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