Question detail
Which of the following gases can be monitored using infrared spectroscopy?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Organic analysis
Question
- A. O2
- B. N2
- C. CO2
- D. He
Answer
CO2
Explanation
Infrared spectroscopy can effectively monitor gases like CO2 because it has specific vibrational modes that absorb infrared radiation. In contrast, gases like O2 and N2 do not have significant infrared absorption features.
Common mistake
Misunderstanding Infrared Absorption
Students often confuse the specific absorption peaks of gases like CO2, CH4, and H2O, leading to incorrect identification of functional groups.
To accurately identify gases using infrared spectroscopy, remember that each gas has unique absorption peaks. For example, CO2 absorbs around 2350 cm⁻¹, CH4 has peaks near 3000 cm⁻¹, and H2O shows strong absorption around 3400 cm⁻¹. Use these values to confirm the presence of each gas.
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