Mass spectrometry Quiz
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5 questions, one answer each
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1. A sample of neon has peaks at m/z 20, 21 and 22 with abundances 90.5, 0.3 and 9.2. What is the relative atomic mass?
- A. 20.2
- B. 21.0
- C. 20.9
- D. 20.0
2. What happens to atoms in the ionisation stage of a mass spectrometer?
- A. They gain electrons to form negative ions
- B. They are accelerated by a magnetic field
- C. They lose an electron to form positive ions
- D. They are split into protons and neutrons
3. Copper has Ar = 63.5 and two isotopes, ⁶³Cu and ⁶⁵Cu. Which is the abundance of ⁶³Cu?
- A. 50 %
- B. 75 %
- C. 25 %
- D. 63.5 %
4. A 2+ ion of ⁵⁶Fe is detected at which m/z?
- A. 112
- B. 56
- C. 28
- D. 58
5. Which are the relative heights of the molecular ion peaks for Br₂ if ⁷⁹Br and ⁸¹Br are equally abundant?
- A. 1 : 1 : 1
- B. 1 : 2 : 1
- C. 2 : 1 : 2
- D. 1 : 3 : 1