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MCQ on UV-Visible spectroscopy: Page-14

66. The compound used to calibrate absorbance scale of the UV-visible instrument is

(A) HCl

(B) K2Cr2O7

(C) KCl

(D) KMnO 4

67. The units for absorbance are

(A) L mol -1 cm -1

(B) g mol -1 cm -1

(C) Mol. L -1.cm =1

(D) None of the above

68. At cut-off wavelength the absorbance of the solvent is

(A) 0

(B) 0.5

(C) 1

(D) 2

69. The lmax in first derivative curve of UV spectra is denoted by slope value as

(A) 1

(B) 0

(C) -1

(D) Maximum

70. Dynodes are present in

(A) Barrier layer detector

(B) Phototube

(C) Photomultiplier tube

(D) Diode array