INBDE (Integrated National Board Dental Examination) Practice Exam

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Which compound provides an electron to reduce oxidized phenidone to its original active state?

  1. Hydroquinone

  2. Sodium thiosulfate

  3. Sulfur

  4. Ammonium thiosulfate

The correct answer is: Hydroquinone

Hydroquinone is a reducing agent that can donate electrons to oxidized phenidone, effectively reducing it back to its active state. On the other hand, sodium thiosulfate, sulfur, and ammonium thiosulfate do not have the ability to donate electrons and therefore cannot reduce oxidized phenidone. This makes them incorrect choices for this question.

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