Virtual Labs

Instrumentation and Working Principles Principles of Mass Spectroscopy

1. In a mass spectrometer, the sample that has to be analysed is bombarded with which of the following?

a: Protons Explanation

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b: Electrons Explanation

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c: Neutrons Explanation

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d: Alpha particles Explanation

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2. Which of the following statements is not true about mass spectrometry?

a: Impurities of masses different from the one being analysed interferes with the result Explanation

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b: It has great sensitivity Explanation

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c: It is suitable for data storage Explanation

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d: It is suitable for library retrieval Explanation

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3. Decide whether a statement about resolution (R) is true or not.

a: The higher the mass spectrometric resolution, the worse the distinction between two only slightly differing m/z. Explanation

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b: Assuming a resolution of 1000, you can distinguish between m/z 10.00 and m/z 10.01. Explanation

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c: Assuming a resolution of 1000, you can distinguish between m/z 1000.00 and m/z 1000.01. Explanation

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d: The higher the mass spectrometric resolution, the better the distinction between two only slightly differing m/z. Explanation

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4. What do the heights of the peaks represent in the mass spectrum?

a: number of ions Explanation

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b: relative abundance of each ion Explanation

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c: average atomic mass Explanation

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d: charge:mass ratio Explanation

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5. Which of the following formulae is consistent with a molecular ion of m/z 73 in a mass spectrometry experiment?

a: C₃H₈N₂ Explanation

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b: C₄H₁₁N Explanation

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c: C₄H₁₀O Explanation

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d: C₃H₅NO Explanation

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