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

question 18

Multiple Choice

Trace amounts of oxygen gas can be "scrubbed" from gases using the following reaction:
4 Cr²⁺(aq) + O₂(g) + 4 H⁺(aq) → 4 Cr³⁺(aq) + 2 H₂O(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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