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

Questions
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?

Organic Chemistry

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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