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Trace Amounts of Oxygen Gas Can Be "Scrubbed" from Gases

Question 83

Multiple Choice

Trace amounts of oxygen gas can be "scrubbed" from gases using the following reaction: 4Cr2+(aq) + O2(g) + 4H+(aq) → 4Cr3+(aq) + 2H2O(l)
Which of the following statements is true regarding this reaction?


A) Oxygen gas is reduced to water.
B) Cr2+(aq) is the oxidizing agent.
C) O2(g) is the reducing agent.
D) Electrons are transferred from O2 to Cr2+.

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