Transcription of Questions on Instrumental Methods of Analysis
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Questions on Instrumental Methods of Analysis
1 Questions on Instrumental Methods of Analysis 1. Which one of the following techniques can be used for the detection in a liquid chromatograph? a. Ultraviolet absorbance or refractive index measurement. b. Increase in temperature c. Ionization in flame d. Thermal conductivity Answer = a 2. Considering high performance liquid chromatography, which one of the following statements is FALSE? a. HPLC is suitable for the separation and determination of the nonvolatile (high boiling point) components. b. The stationary phase could be a liquid or a solid. c. Columns longer than 50 meters have been used here to increase the efficiency of separation. d. High pressure is used here to decrease the retention time and improve the separation of components. Answer = c 3. According to Beer s law for a colored solution, which one of the following statements is False?
Aqueous KMnO 4 solutions are purple. A plot of absorbance against concentration is: a. non-linear. b. linear with a negative gradient. c. linear with a positive gradient. d. an exponential curve. Answer = c 37.A shift to lower wavenumber for an absorption in a spectrum corresponds to: a. a loss of intensity. b. a shift to lower wavelength.
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