Problem: Which of the following reagents would oxidize Fe to Fe2+ , but not Fe to Fe3+ ?A) Co2+B) Ca2+C) Br-D) CoE) CaF) Br2

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The ease to remove an electron from an element is also related to cell potential.

Smaller (↓) E° → oxidation → weaker oxidizing agent
Larger (↑) E° → reduction → stronger oxidizing agent


Given:

Fe2+ + 2 e  Fe                  E° = ‒0.41 V

Fe3+ + 3 e  Fe                  E° = ‒0.04 V

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Problem Details

Which of the following reagents would oxidize Fe to Fe2+ , but not Fe to Fe3+ ?

A) Co2+
B) Ca2+
C) Br-
D) Co
E) Ca
F) Br2

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