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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