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Problem: Which element is oxidized in the reaction below?Fe(CO)5 (l) + 2HI (g) → Fe(CO)4I2 (s) + CO (g) + H2 (g)A) HB) CC) FeD) IE) O

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We’re being asked to identify the element is oxidized in the given reaction:

Fe(CO)5 (l) + 2HI (g) → Fe(CO)4I2 (s) + CO (g) + H2 (g)


To do so, we need to identify the change in oxidation state for each element in the reaction. 

Recall the mnemonic for redox reactions:

Loss Electrons  Oxidation 

Gain Electrons  Reduction


This means the element that gains electrons is reduced while the element that loses electrons is oxidized


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Problem Details

Which element is oxidized in the reaction below?

Fe(CO)5 (l) + 2HI (g) → Fe(CO)4I2 (s) + CO (g) + H2 (g)

A) H

B) C

C) Fe

D) I

E) O