Electronic Spectra: 18 MCQs
All 18 multiple-choice questions from this kit, free and with no sign-up.
Warm-up · 6 questions
Q1. What is an electronic spectrum?
BeginnerAnswers and explanations are in the Veda app.
Q2. Which equation relates the energy gap $\Delta E$ to the frequency $\nu$ of the absorbed photon?
BeginnerAnswers and explanations are in the Veda app.
Q3. In which region of the electromagnetic spectrum do electronic transitions typically occur?
BeginnerAnswers and explanations are in the Veda app.
Q4. An absorption spectrum shows:
BeginnerAnswers and explanations are in the Veda app.
Q5. Why do atomic spectra consist of sharp lines?
BeginnerAnswers and explanations are in the Veda app.
Q6. The energy gap for an electronic transition is related to the photon wavelength by $\Delta E = hc/\lambda$; a gap of about $2\ \text{eV}$ corresponds to visible light near $620\ \text{nm}$.
BeginnerAnswers and explanations are in the Veda app.
Building up · 7 questions
Q7. Molecular electronic spectra appear as broad bands because:
IntermediateAnswers and explanations are in the Veda app.
Q8. The Franck–Condon principle explains:
IntermediateAnswers and explanations are in the Veda app.
Q9. Which selection rule states that $\Delta S = 0$ for allowed electronic transitions?
IntermediateAnswers and explanations are in the Veda app.
Q10. According to the Laporte rule, which transition is forbidden in a centrosymmetric molecule?
IntermediateAnswers and explanations are in the Veda app.
Q11. Forbidden transitions are:
IntermediateAnswers and explanations are in the Veda app.
Q12. The Beer–Lambert law relates absorbance to:
IntermediateAnswers and explanations are in the Veda app.
Q13. A chromophore is:
IntermediateAnswers and explanations are in the Veda app.
Topper level · 5 questions
Q14. Extending conjugation in a molecule typically causes:
AdvancedAnswers and explanations are in the Veda app.
Q15. The observed colour of a substance is:
AdvancedAnswers and explanations are in the Veda app.
Q16. Which hydrogen series appears in the visible region?
AdvancedAnswers and explanations are in the Veda app.
Q17. Given a molecule with a chromophore that has a HOMO-LUMO gap of 2.5 eV, which of the following statements is true regarding its electronic absorption spectrum?
AdvancedAnswers and explanations are in the Veda app.
Q18. A spectrophotometer measures the absorbance of a solution and produces a spectrum with peaks at certain wavelengths. If the intensity at a peak is significantly higher than at neighboring wavelengths, what can be inferred about the electronic transition responsible for this peak?
AdvancedAnswers and explanations are in the Veda app.
Your notes can be a kit like these
Every kit here was made from real study material. Point Veda at a chapter, a PDF, a photo or a link and get notes, flashcards, practice MCQs, games and a scored test — free, in 42 languages.
- Chapter notes
- Flashcards
- Practice MCQs
- Scored tests
- Exam prep
Get Veda free See what students get
Free to start · No ads · Works in 42 languages