Q. In UV-Vis spectroscopy, what is the effect of increasing the path length of the sample cell?
A.Decreases absorbance
B.Increases absorbance
C.No effect on absorbance
D.Increases transmittance
Solution
Increasing the path length of the sample cell increases the absorbance according to the Beer-Lambert Law, as absorbance is directly proportional to path length.
Q. What is the significance of the peak position in an IR spectrum?
A.It indicates the concentration of the sample
B.It reveals the molecular weight of the compound
C.It provides information about the types of bonds present
D.It determines the solubility of the compound
Solution
The peak position in an IR spectrum provides information about the types of bonds present in the molecule, as different bonds absorb at characteristic frequencies.
Correct Answer: C — It provides information about the types of bonds present
Q. What type of bond is primarily detected in the fingerprint region of an IR spectrum?
A.C-H bonds
B.O-H bonds
C.C-C bonds
D.Complex vibrations of multiple bonds
Solution
The fingerprint region of an IR spectrum (typically 400-1500 cm-1) is characterized by complex vibrations of multiple bonds, making it unique for different compounds.
Correct Answer: D — Complex vibrations of multiple bonds