Q.1
NMR is used to determine
  • the function groups present in inorganic molecules
  • the molar mass of the compound
  • the structure of the molecule
  • the number of different carbon or hydrogen enviroments in the molecule
Q.2
Mass spectrometer requires
  • High temperature
  • High cooling
  • High vacuum
  • High pressure
Q.3
What are the main criteria on which mass spectrometer used for?
  • Composition in sample
  • Relative mass of atoms
  • Concentration of elements in the sample
  • Properties of sample
Q.4
Which of the following statement is false for mass spectroscopy?
  • Mass spectroscopy is used to identify unknown compounds within a sample, and to elucidate the structure and chemical properties of different molecules
  • Particle are characterized by their mass to charge ratios (m/z) and relative abundances
  • This technique basically studies the effect of ionizing energy on molecules
  • This technique can be used on all state of matter
Q.5
Choose the correct sequence of MS procedure ?p. The ion signal is processed into mass spectra.q. The ions are detected usually by a quantitative method.r. The ions are separated according to their mass to charge ratio in an analyzer by electromagnetic fields.s. The components of the sample are ionized by one of a variety of methods (e.g. by impacting them with an electron beam) which result in the formation of charged particles.t. A sample is loaded into the MS instrument and undergoes vaporization
  • p→q→r→s→t
  • t→s→r→q→p
  • p→t→r→s→q
  • q→t→r→s→p
Q.6
A molecule has a broadband at 3200cm-1 and sharp band at 1711cm-the molecule is most likely an
  • amide
  • ester
  • alkanol
  • carboxylic acid
Q.7
Name an ionization technique which uses a capillary tube to form molecular ions prior to charge transfer with an analyte
  • Electrospray Ionization
  • Atmospheric Pressure Photoionization
  • Matrix –Assisted Laser Desorption Ionization
  • Atmospheric Pressure Chemical Ionization
Q.8
The infrared spectrum was obtained from a compound and showed absorptions atcm-cm-andcm- Identify the compound.
  • CH3COOCH3
  • C6H5COOH
  • CH2=CHCH2OH
  • CH≡CCH2CO2CH3
Q.9
Which of the following type of electromagnetic radiation has the longest wavelength
  • infrared
  • ultraviolet
  • microwaves
  • radiowaves
Q.10
NMR can only be done with
  • molecules
  • 1H and 13C
  • any element with a odd number of protons
  • any element with a odd number of nucleons
Q.11
The average atomic mass for nitrogen is 14.amu. If you have a sample of nitrogen atoms, what is the chance that one randomly selected atom will have a mass of 14.amu?
  • 0.0%
  • 0.0067%
  • 90%
  • 100%
Q.12
The number of peaks inNMR for CH3 CH2 CH3 is
  • 0
  • 1
  • 2
  • 3
Q.13
The number of peaks inNMR for CH3 CH2 CH3 is
  • 0
  • 1
  • 2
  • 3
Q.14
The splitting pattern for the Hydrogen on the middle carbon in high resolutionNMR for CH3 CH2 CH3 is
  • a sextet
  • a heptet
  • a triplet
  • a quartet
Q.15
The splitting pattern for the Hydrogen on the carbon at the end in high resolutionNMR for CH3 CH2 CH3
  • a sextet
  • a heptet
  • a triplet
  • isa quartet
Q.16
Which of the following would be different for 1-butanol and 2-butanol
  • The number of peaks on low res H NMR
  • the molar mas
  • the number of peaks in C NMR
  • the finger print region of the infrared spectrum
Q.17
Splitting occurs only in
  • low resolution H NMR
  • high resolution H NMR
  • low resolution C NMR
  • high resolution C NMR
Q.18
The splitting pattern for the hydrogen bonded to the oxygen in CH3CH(OH)CH3
  • 0
  • 1
  • 2
  • 3
Q.19
Stronger bonds absorb IR at
  • higher wave numbers
  • lower wave numbers
  • in the finger print region
  • 600cm-1
Q.20
A molecule absorbs IR at a wavenumber ofcm- Which functional group could account for this absorption.I. aldehydesII. estersIII. ethers
  • I only
  • I and II
  • I, II and III
  • none of the above
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