The Reaction H₂O₂(l) + 3I^-(aq) + 2 H⁺(aq) → I₃^-(aq)

question 27

Multiple Choice

The reaction H₂O₂(l) + 3I^-(aq) + 2 H⁺(aq) → I₃^-(aq) + 2H₂O(aq) occurs very rapidly. Based on this observation alone, what can we say about this reaction?

• A) The reaction probably occurs as a single fast step.
• B) The reaction probably occurs as a series of steps, each of which is fast.
• C) The reaction is endothermic.
• D) The reaction is exothermic.

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