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MCQ on UV-Visible spectroscopy: Page-15

71. Positive deviation from Beer’s law is due to

(A) Absorption of stray radiation

(B) Non absorption of stray radiation

(C) It does not depend on stray radiation

(D) None of the above

72. All of the following change the absorptivity of a sample EXCEPT

(A) Concentration

(B) Molecular structure

(C) Wavelength of radiation

(D) Temperature

Absorptivity depends upon the temperature , solvent , molecular structure and wavelength of the radiation

73. A sample contains a polyprotic acid absorbs at different wavelengths. The sample can be analyzed at the wavelength of

(A) Max wavelength

(B) Max absorptivity

(C) Isosbestic point

(D) Highest pH

74. Absorption spectra is a plot of

(A) Absorbance Vs Concentration

(B) Absorbance Vs wavelength

(C) % T Vs Wavelength

(D) % T Vs Concentration

75. Cut off wave length is the wavelength

Below which a solvent absorbs too much radiation

Above which a solvent absorbs too much radiation

Below which an analyte absorbs too much radiation

Above which a analyte absorbs too much radiation