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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