11. A gas chromatographic column was used to separate a pair of compounds. The retention times for these two compounds were 11.56 minutes and 11.71 minutes respectively. If the dead time for mobile phase was 1.60 minutes and the theoretic plate height (HETP) was 0.28 mm under the separation condition, what is the column length (in meter) and peak width (in seconds) for these compounds should be when they need to be just totally resolved? Give the equation:
(A) ~80 m and ~6 s.
(B) ~70 m and ~8 s.
(C) ~50 m and ~7 s.
(D) ~60 m and ~6 s.
(E) ~50 m and ~8.0 s.

7. Corrected retention times for ethyl, n-propyl and n-butyl alcohols on a column are 0.69, 1.51, and 3.57 minutes respectively. Predict retention times for the next two members of the homologous series.(A) 7.20 and 15.88 minuses.(B) 8.00 and 18.20 minuses.(C) 5.67 and 14.36 minuses.(D) 6.54 and 13.78 minuses.(E) 8.99 and 17.56 minuses.

複選題8. Which of the following factors can result in line broaden for an atom emission line width?(A) Collision between atom and other species in measurement system.(B) The lifetime of the atomic transition states are finite, usually the lifetime of ground state is longer the lifetime of excited state.(C) The direction of the fast moving atom, toward to or receding from a radiation transducer in measurement system.(D) Solvent type used for dissolving sample.(E) Types of energy source for excitation atom in measurement system.

9. Which of the following is/are not the sources of an instrument noise?(A) Shot noise.(B) Flicker noise.(C) Chemical noise.(D) Environmental noise.(E) Thermal noise.

10. Which of the following spectrometers usually requires very high resolution and more expensive optical equipment (monochromator) due to their highly complex spectrum lines?(A) Induced coupled plasma atomic emission spectrometer.(B) Flam fluoresces atomic spectrometer.(C) Electro thermal atomic absorption spectrometer.(D) Fourier transforms IR spectrometer.(E) Spark source atomic spectrometer.

12. A monochromator had a focal length of 0.65 m was equipped with an echellette grating of 2000 blazes per millimeter. If 3.0 centimeter of the grating were illuminated, please calculate the reciprocal linear dispersion (in nm/mm)； resolving power, minimum difference of wavelength (in nm) can be resolved and slit width (in µm) of the instrument for the first order spectra at approximately 560 nm. Give the equations: (A) 0.77nm/mm, 6.0×104, 0.0093 nm, 6.0 µm.(B) 0.57 nm/mm, 6.0×104, 0.0063 nm, 12 µm.(C) 0.57 nm/mm, 7.2×104, 0.0093 nm, 6.0 µm.(D) 0.77 nm/mm, 7.2×104, 0.0063 nm, 6.0 µm.(E) 0.77 nm/mm, 6.0×104, 0.0093 nm, 12 µm

13. The amperometric titration of with is carried out at an applied potential where both titrand and titrant both are reducible but product not. The entire reaction is shown below. The titration curve would resemble most closely which of the following?(A)(B)(C)(D)(E)

14. Which of the following is not a desirable property of an indicator to be used in a complexometric titration that involves EDTA?(A) The indicator for complexometric titration should be a Lewis base.(B) The indicator should bind more tightly to the analyte metal than does EDTA.(C) The complexation reaction between the indicator and the analyte metal should be reversible.(D) The uncomplexed form of the indicator should be a different color than the indicator-metal complex.(E) The indicator should be highly soluble in the sample.

15. In plotting data from the potentiometric titration of a strong acid with a strong, a plot of the change in pH per change in volume of titrant (△pH/△V) versus volume of titrant will have which of the following shapes?(A)(B)(C)(D)(E)

16. Analysis of a bottle of 100 mg aspirin tablets yields an average aspirin content of 99.8 mg, with a standard deviation of ±0.3 mg. Assuming Gaussian statistics, which of the following statements is true?(A) None of the tablets contains less than 99.5 mg of aspirin.(B) 68% of tablets contain between 99.5 and 100.1 mg of aspirin.(C) 97% of tablets contain between 99.5 and 100.1 mg of aspirin.(D) All of the tablets contain less than 100 mg of aspirin.(E) The average value is incorrect.

17. The ionic strength of a solution depends on which of the following? I. The size of ions II. The charges on ions III. The concentration of the ions(A) I and II only.(B) I and III only(C) I, II and III only(D) II and III only(E) None of them.