51. The indicator used in nonaqueous titration of barbiturates is: A. Thymol blue B. Phenolphthalein C. Bromocresol green D. Crystal violet Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
52. An essential requirement of the mobile phase in HPLC is that A. Constant flow rate with pulses B. Freshly distilled C. It must run 20°C only D. Must flow with pulses Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
53. In gel permeation chromatography molecules are separated on the basis of their A. Chemical nature B. Size and shape C. Adsorptive properties D. Partition coefficient Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
54. Chopper is used in which instrument? A. H. P. T. L. C. B. H. P. L. C. C. Single beam photometer D. A. A. S. Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
55. Pre-mix burner is also known as . . . . . . . . A. Total consumption burner B. Meeker burner C. Laminar flow burner D. Bunsen burner Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
56. Affinity chromatography specialized form of A. Adsorption chromatography B. Partition chromatography C. Both of the above D. Size exclusion chromatography Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
57. The solvent used in NMR studies is A. Phenol B. Acetaldehyde C. Carbon tetrachloride D. Chloroform Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
58. A substance used for modification of silica gel for reversed phase TLC is: A. Glycerin B. Silicone oil C. Ether D. Benzene Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
59. Stationary phase in thin-layer chromatography (TLC) is A. Adsorbent B. Liquid held between glass plate & adsorbent C. Glass plate D. None of these Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
60. Which of the following is most affected by the temperature changes in flame photometry? A. Absorption spectrometry B. Atomic spectrometry C. Emission spectrometry D. Molecular spectrometry Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board