AP Chemistryhardmcq1 pt
Using E°: Fe²⁺/Fe = −0.44 V and Fe³⁺/Fe²⁺ = +0.77 V, which statement is correct?
A.Fe²⁺ reduces Fe³⁺ to Fe metal
B.Fe³⁺ oxidizes Fe metal to Fe²⁺
C.Fe metal reduces Fe²⁺ to Fe
D.No reaction between iron species is possible
Explanation
Core Concept
Fe³⁺ + e⁻ → Fe²⁺ (0.77) with Fe → Fe²⁺ + 2e⁻ (−0.44): E°cell = 0.77 − (−0.44) = 1.21 V — spontaneous. Fe³⁺ is a strong enough oxidant to corrode iron.
Correct Answer
BFe³⁺ oxidizes Fe metal to Fe²⁺
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