Chemical Evidence in Forensic Science Quiz Crafted By-
Pratima Kumari
Introduction to Chemical Evidence in Forensic Science
Forensic chemistry is the application of chemistry and its subfield, forensic toxicology, in a legal setting. A forensic chemist can assist in the identification of unknown materials found at a crime scene. Specialists in this field have a wide array of methods and instruments to help identify unknown substances. These include high-performance liquid chromatography, gas chromatography-mass spectrometry, atomic absorption spectroscopy, Fourier transform infrared spectroscopy, and thin layer chromatography. The range of different methods is important due to the destructive nature of some instruments and the number of possible unknown substances that can be found at a scene. Forensic chemists prefer using nondestructive methods first, to preserve evidence and to determine which destructive methods will produce the best results.
Let's look at the questions and their answers.
Ques 1. Following is a set of chemical evidence
a) Drugs, explosives, ink
b) Semen, blood, saliva
c) Soil, Mud, plastic
d) Diatoms, fungi, pollen
Answer- a) Drugs, explosives, ink
Ques 2. Acetaldehyde gives which colour with schiff's reagent?
a) Blue
b) Red
c) Green
d) Pink
Answer- d) Pink
Ques 3. Gun powder and Nitrocellulose are examples of
a) Trace evidence
b) Biological evidence
c) Chemical evidence
d) Both a and c
Answer-d) Both a and c
Ques 4. Vapour Trace analyzer is used to detect
a) Non volatile organic compounds
b) Volatile organic compounds
c) Volatile inorganic compounds
d) Non volatile inorganic compounds
Answer-b) Volatile organic compounds
Ques 5. Sarin Gas is
a) Nerve agent
b) Respiratory agent
c) Systemic agent
d) Skin agent
Answer-a) Nerve agent
Ques 6. Chemical analysis of the dyes in the fibre may be performed using
a) LCMS
b) ICPM
c) NAA
d) FTIR
Answer-d) FTIR
Ques 7. Chemical erasures can be deciphered by
a) Reflected light
b) Polarized light
c) Thiocyanic acid
d) All of the above
Answer-c) Thiocyanic acid
Ques 8. Sodium fluoride is not used for the preservation of
a) Cyanide
b) Arsenic
c) Alcohol
d) Carbon monoxide
Answer-b) Arsenic
Ques 9. Paint can be analyzed by
a) Gel diffusion
b) Electrophoresis
c) Absorption elution method
d) Pyrolysis gas chromatography
Answer-d) Pyrolysis gas chromatography
Ques 10. Age of the ink can be determined by
a) Colour
b) Chloride diffusion
c) Sulphate diffusion
d) None of the above
Answer-b) Chloride diffusion