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      Question

      Why is commercial nitric acid typically yellow or brown

      in color?
      A Presence of oxygen Correct Answer Incorrect Answer
      B Presence of nitrous oxide Correct Answer Incorrect Answer
      C Presence of nitrogen dioxide Correct Answer Incorrect Answer
      D Colored impurities Correct Answer Incorrect Answer

      Solution

      Commercial nitric acid appears yellow or brown because it contains dissolved nitrogen dioxide (NOтВВ), a brown gas that forms when nitric acid decomposes, especially in the presence of light.

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