B.Sc. Second year Undergraduate degree course (CBCS Pattern)
Semester Third
Physical Chemistry (CHE-312)
Chapter – Colorimetry
Multiple Choice questions:
1. Beer’s law states that the
intensity of light decreases with respect to ___________
a) Concentration
b) Distance
c) Composition
d) Volume
Answer: (a)
2. Lambert’s law states that the
intensity of light decreases with respect to __________
a) Concentration
b) Distance
c) Composition
d) Volume
Answer: (b)
3. 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
Answer :( c)
4. The representation of Beer
Lambert’s law is given as A = ЄCl. If ‘l’ represents distance, ‘C’
represents concentration and ‘A’ represents absorption, what does ‘Є’
represent?
a) Intensity
b) Transmittance
c) Absorptivity
d) Admittance
Answer: (c)
5. Which of the
following is not a limitation of Beer Lambert’s law, which gives the relation
between absorption, thickness and concentration?
a) Concentration must be lower
b) Radiation must have higher bandwidth
c) Radiation source must be monochromatic
d) Does not consider factors other than thickness
and concentration that affect absorbance
Answer: (b)
6. Which of the
following is not a property or parameter of electromagnetic radiation?
a) Wavelength
b) Voltage
c) Wave number
d) Amplitude
Answer: (b)
7. 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
Answer: (c)
8. Absorbance is a…….
a)
Extensive property
b) Additive property
c) Intensive property
d) Constitutive property
Answer: (b)
9. When a beam of
monochromatic radiation is passed through a transparent absorbing medium, the
decrease in the intensity of radiation is directly proportional to the
concentration
a) Beers Law
b) Lamberts Law
c) Lamberts Beers law
d) None of these
Answer: (c)
10. Molar absorptivity is denoted by
letter
a) λ
b)
c) β
d) Є
Answer: (d)
11. The
absorbance is given by
a) A = Cl
b) A = ∈Cl
c) A= ECl
d) M=∈Cl
Answer: (b)
12. Molar absorptivity is given by…….
a) A = Cl
b) Є= A/Cl
c) Є= E/Cl
d) M=∈Cl
Answer: (b)
Colorimetry: Interaction of electromagnetic radiation with matter
Colorimetry:Lamberts Law,Beer's Law,Lambert-Beer's Law, Molar absorptivity
Colorimetry: Limitations of Beer –Lambert’s law,Deviation from Beers Law,Reasons for Deviation from Beer's Law.
Colorimeter: Principle, Construction and components, working, Applications
Colorimetry Multiple Choice questions
