Problem: Which of the following metals is the best reducing agent?A) CrB) AlC) MnD) Cd

FREE Expert Solution

To determine which of the following metals is the best reducing agent:


 Find Standard reduction potentials


Smaller (↓) E° → oxidation → stronger reducing agent

Larger (↑) E°→ reduction → weaker reducing agent


Cd2+(aq) + 2 e- → Cd(s)        -0.40 V

Mn2+(aq) + 2 e- →Mn(s)       = -1.18 V

Al3+(aq) + 3 e- →Al(s)           = -1.66 V

Cr3+(aq) + 3 e- →Cr(s)           -0.73 V

  • for negative numbers → ↑ number → smaller 
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Problem Details

Which of the following metals is the best reducing agent?

A) Cr

B) Al

C) Mn

D) Cd