WorksheetsSpectroscopy & ANALYTICAL TECHNIQUES
Total questions: 60
Worksheet time: 51mins
The different types of energies associated with a molecule are
Electronic energy
Vibrational energy
Rotational energy
All of the mentioned
During the motion, if the centre of gravity of molecule changes, the molecule possess __________
Electronic energy
Rotational energy
Translational energy
Vibrational energy
The correct order of different types of energies is __________
Eel >> Evib >> Erot >> E tr
Eel >> Erot >> Evib >> E tr
Eel >> Evib >> Etr >> E rot
Etr >> Evib >> Erot >> E el
The analysis of electromagnetic radiation scattered, absorbed or emitted by the molecule is called __________
a) Kaleidoscopy
b) Astronomy
c) Spectroscopy
d) Anatom
The energy level with lower energy is called __________
a) Ground state energy level
b) Initial state energy level
c) Excited state energy level
d) All of the mentioned
Absorption spectrum results when an electron in an atom undergoes a transition from __________
a) Higher energy level to a lower one
b) Lower energy level to a higher one
c) Intermediate levels
d) All of the mentioned
elect the incorrect statement from the following option.
a) Emission spectrum results when an electron in an atom undergoes a transition from excited state to the ground state
b) In the emission spectrum, transition takes place with the emission of a photon of energy hν
c) In the emission spectrum, transition takes place with the absorption of a photon of energy hν
d) All of the mentioned
Arrange the various electronic transitions in the order of increasing energy.
a) n→σ* < π→π* < n→π* < σ→σ*
b) n→π* < π→π* < n→σ* < σ→σ*
c) n→σ* < n→π* < π→π* < σ→σ*
d) σ→σ* < π→π* < n→π* < n→σ
Vibrational spectroscopy involves the transitions falling in the spectral range of ____________
a) 100-1000 cm-1
b) 300-3000 cm-1
c) 400-4000 cm-1
d) 500-5000 cm-1
Which of the region of IR spectra appears between (1400-600) cm-1?
a) Functional group region
b) Fingerprint region
c) Low-frequency region
d) None of the mentioned
Select the correct statement from the following option.
a) Infrared spectra can identify the unknown materials
b) It can determine the amount of components in a mixture
c) It can also determine the quality of a sample
d) All of the mentioned
What is the wavelength range for UV spectrum of light?
a) 400 nm – 700 nm
b) 700 nm to 1 mm
c) 0.01 nm to 10 nm
d) 10 nm to 400 nm
Beer Lambert’s law gives the relation between which of the following?
a) Reflected radiation and concentration
b) Scattered radiation and concentration
c) Energy absorption and concentration
d) Energy absorption and reflected radiation
In which of the following ways, absorption is related to transmittance?
a) Absorption is the logarithm of transmittance
b) Absorption is the reciprocal of transmittance
c) Absorption is the negative logarithm of transmittance
d) Absorption is a multiple of transmittance
Beer’s law states that the intensity of light decreases with respect to ___________
a) Concentration
b) Distance
c) Composition
d) Volume
Lambert’s law states that the intensity of light decreases with respect to __________
a) Concentration
b) Distance
c) Composition
d) Volume
The electronic spectra in the visible range span is __________
-
a) 25000-72000 cm-1
b) 25000-50000 cm-1
c) 12500-25000 cm-1
d) 15000-30000 cm
Which of the following statements is false about single beam absorption instruments?
a) Tungsten bulb is used as a source
b) Beam splitter is used to get parallel beam
c) Test tube is used as sample holder
d) Photovoltaic cell as detector
Which of the following is the principle of Flame emission photometers?
a) Radiation is absorbed by non-excited atoms in vapour state and are excited to higher states
b) Medium absorbs radiation and transmitted radiation is measured
c) Colour and wavelength of the flame is measured
d) Only wavelength of the flame is measured
In Flame emission photometers, the measurement of _____________ is used for qualitative analysis.
a) Colour
b) Intensity
c) Velocity
d) Frequency
In Flame emission photometers, the measurement of _____________ is used for quantitative analysis.
a) Colour
b) Intensity
c) Velocity
d) Frequency
Which of the following is not a detector used in Flame emission photometers?
a) Photronic cell
b) Photovoltaic cell
c) Photoemissive tube
d) Chromatogram
Which of the following is the principle of Atomic Absorption Spectroscopy?
a) Radiation is absorbed by non-excited atoms in vapour state and are excited to higher states
b) Medium absorbs radiation and transmitted radiation is measured
c) Colour is measured
d) Colour is simply observed
In Atomic Absorption Spectroscopy, which of the following is the generally used radiation source?
a) Tungsten lamp
b) Xenon mercury arc lamp
c) Hydrogen or deuterium discharge lamp
d) Hollow cathode lamp
In Atomic Absorption Spectroscopy, with what material is the cathode in Hollow cathode lamp constructed?
a) Tungsten
b) Quartz
c) Element to be investigated
d) Aluminium
In voltaic cell, anode and cathode of the cell is
copper electrode, zinc
zinc, copper
aluminium, zinc
nickel, cobalt
The emf of the dry cell is about
0 V
0.5 V
1 V
1.5 V
Secondary’s cells are
lead acid cell
alkaline cell
both (a) and (b)
none of these
What unit of measurement do we use to measure electrical potential energy in a battery?
Watts
Volts
Amps
Ohms
Car batteries do which of the following?
A) Convert mechanical energy to electrical energy
B) Convert chemical energy to electrical energy
C) Store electrical energy
D) Both A and B are correct
E) Both B and C are correct
In an electrolysis, anions get discharged by ________ electrons at the ___________
gaining, cathode
losing, anode
gaining, anode
losing, cathode
Positive ions (cations) move towards the cathode (-) where they will discharge by....
Breaking apart
Losing electrons
Clumping together.
Gaining electrons
What is the half-equation for the discharge of hydroxide ions?
2O2- --> O2 + 4e-
OH- --> OH + e
4OH- --> 2H2O + O2 + 4e-
2H2O + O2 + 4e- --> 4OH-
What happens to hydrogen molecules in a hydrogen-oxygen fuel cell?
They form hydrogen ions, H+ , and electrons, e-
They form hydrogen ions, H+ , and electrons, e+
They form hydrogen atoms, H
What happens to oxygen molecules in a hydrogen-oxygen fuel cell?
They react with electrons to form oxide ions, O2-
They react with hydrogen ions to form hydroxide ions, OH-
They react with hydrogen ions and electrons to form water
How do fuel cells produce energy (look at the image)
The hydrogen gives of oxygen to create energy then recombine to create water.
Oxygen enters then gives of a electron then combines with hydrogen to create water.
Hydrogen gives of an electron then recombined with the electron and oxygen to create water.
All of the above
The ___________ fuel cell uses potassium hydroxide as the electrolyte.
Solid Oxide
Phosphoric Acid
Alkaline
Polymer Exchange Membrane
What characteristic of the light absorbed is compared between known and unknown samples in UV-visible spectroscopy?
frequency
energy
wavelength
colour
Which of the following gives the "fingerprint" of a substance?
visible
infrared
uv
no one of these is unique
Electromagnetic waves vary in
the speed they travel in a vacuum.
wavelength and frequency.
the way they reflect.
the orientation of their electric and magnetic fields.
