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单选题 In GC, temperature programming is most suitable for separating samples with _______
学科：默认课程
时间：2025-11-25 01:08:00
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题目1单选题
If GC is used to detect organochlorine pesticide (有机氯农药) residue in apples, the most suitable detector is ______A. ECDB. FPDC. FIDD. TCD
题目2单选题
In GC, temperature programming is most suitable for separating samples with _______A. narrow boiling rangeB. different polarityC. similar polarityD. broad boiling range
题目3单选题
According to the plate theory in chromatography, the higher the column efficiency, the ____ the number of theoretical plates (n), and the _____ the theoretical plate height (H)A. bigger, biggerB. bigger, smallerC. smaller, smallerD. smaller, bigger
题目4单选题
In chromatographic analysis, the parameter used for quantitative analysis is ______A. retention timeB. retention volumeC. peak areaD. peak width at half height
题目5单选题
The universal detector in HPLC is _____A. UV detectorB. fluorescence detectorC. differential refractive index detectorD. thermal conductivity detector
题目6单选题
When Russian botanist Tswett studied the components of plant pigments, the chromatographic method he used was ______A. chemically bonded phase chromatographyB. liquid-solid adsorption chromatographyC. liquid-liquid partition partition chromatographyD. size exclusion chromatography
题目7单选题
In chromatographic analysis, when two components achieve complete separation, the resolution should be______A. R ≥ 2.0B. R ≥ 1.0C. R ≥ 1.5D. R ≥ 0.5
题目8单选题
In chromatographic analysis, if the column length increases from 0.5 m to 2 m while other conditions remain unchanged, the resolution (R) changes from R1 to R2. Then the relationship between R1 and R2 is _____A. R2/R1 = 1B. R2/R1 = 2C. R2/R1 = 3D. R2/R1 = 4
题目9单选题
In normal-phase HPLC, the retention time of a component with higher polarity is ______ that of a component with lower polarityA. longer thanB. the same asC. shorter than
题目10单选题
In which of the following chromatographic methods, the mobile phase does not affect the selectivityA. size exclusion chromatographyB. liquid-liquid partition chromatographyC. liquid-solid adsorption chromatographyD. chemically bonded phase chromatography
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