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Organic Chemistry Questions and Answers – Mass Spectroscopy | Organic Chemistry Multiple Choice Questions and Answers

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Free download in PDF Organic Chemistry Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(1) Which of the following statement is false for mass spectroscopy?
[A] Mass spectroscopy is used to identify unknown compounds within a sample, and to elucidate the structure and chemical properties of different molecules
[B] Particle are characterized by their mass to charge ratios (m/z) and relative abundances
[C] This technique basically studies the effect of ionizing energy on molecules
[D] This technique can be used on all state of matter
Answer: This technique can be used on all state of matter
(2) Which of the following main component of mass spectroscopy deal with resolving the ions into their characteristics mass components according to their mass-to-charge ratio?
[A] Ion Source
[B] Analyzer
[C] Detector System
[D] Analyzer tube
Answer: Analyzer

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(3) Who discovered the mass spectrometer?
[A] Francis Aston
[B] J. J Thomson
[C] Ernest O. Lawrence
[D] Walter Kaufmann
Answer: J. J Thomson
(4) In which state of matter mass spectroscopy is being performed?
[A] solid
[B] liquid
[C] gaseous
[D] plasma
Answer: gaseous
(5) A PMR spectrometer operates at 300 MHz. Find the value of magnetic field. Given: gN = 5.585 and BN = 5.05 x 10-27 JT-I.
[A] 7.05 T
[B] 6.38 T
[C] 7.58 T
[D] 5.93 T
Answer: 7.05 T
(6) What are the main criteria on which mass spectrometer used for?
[A] Composition in sample
[B] Relative mass of atoms
[C] Concentration of elements in the sample
[D] Properties of sample
Answer: Relative mass of atoms
(7) A compound of molecular formula C8H7ClO shows a prominent band in its IR spectrum at 1690 cm-1. 1H NMR spectrum revealed only two major types of protons in the ratio of 5: 2. Which one of the following structures best fits the above data?

[A] (a)
[B] (b)
[C] (c)
[D] (d)
Answer: (a)
(8) Which species of the following is used to bombard with the sample for which mass spectroscopy has been performed?
[A] Alpha particles
[B] Neutrons
[C] Electrons
[D] Protons
Answer: Electrons
(9) Separation of ions in mass spectrometer take place on the basis of which of the following?
[A] Mass
[B] Charge
[C] Molecular weight
[D] Mass to charge ratio
Answer: Mass to charge ratio
(10) Which type of ionic species are allowed to pass through the slit and reach the collecting plate?
[A] Negative ions of all masses
[B] positive ions of the specific mass
[C] Negative ions of the specific mass
[D] Positive ions of all masses
Answer: positive ions of the specific mass

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