NEET UG CHEMISTRY Multiple Choice Questions (MCQs)

NEET UG - Organic Chemistry: Purification and Characterisation of Organic Compounds (Q181 - Q195)

181. Which of the following techniques is used for purifying solid organic compounds?
     a) Sublimation
     b) Distillation
     c) Chromatography
     d) Differential extraction
     Answer: a) Sublimation
182. Which method is most suitable for separating a mixture of two liquids with significantly different boiling points?
     a) Crystallization
     b) Sublimation
     c) Distillation
     d) Chromatography
     Answer: c) Distillation
183. In crystallization, the purity of the compound depends on:
     a) The size of the crystal
     b) The temperature of the solvent
     c) The solubility of the compound in the solvent at different temperatures
     d) The boiling point of the solvent
     Answer: c) The solubility of the compound in the solvent at different temperatures
184. What is the principle behind chromatography?
     a) Separation of components based on their volatility
     b) Separation of components based on their solubility
     c) Separation of components based on their distribution between stationary and mobile phases
     d) Separation of components based on their boiling points
     Answer: c) Separation of components based on their distribution between stationary and mobile phases
185. Which technique is best for detecting the presence of halogens in an organic compound?
     a) Sodium fusion test
     b) Distillation
     c) Crystallization
     d) Sublimation
     Answer: a) Sodium fusion test
186. The empirical formula of a compound is determined by:
     a) The molecular weight of the compound
     b) The ratio of the elements in the compound
     c) The number of moles of each element
     d) The boiling point of the compound
     Answer: b) The ratio of the elements in the compound
187. Which of the following methods is used to detect nitrogen in an organic compound?
     a) Lassaigne’s test
     b) Silver nitrate test
     c) Beilstein’s test
     d) Iodine test
     Answer: a) Lassaigne’s test
188. Which of the following is used in the estimation of halogens in an organic compound?
     a) Dumas method
     b) Lassaigne’s test
     c) Finkelstein reaction
     d) Kjeldahl method
     Answer: b) Lassaigne’s test
189. In which of the following processes is the organic compound dissolved in a solvent and then separated from impurities?
     a) Crystallization
     b) Sublimation
     c) Distillation
     d) Differential extraction
     Answer: a) Crystallization
190. Which of the following tests is used for detecting sulfur in an organic compound?
     a) Sodium fusion test
     b) Beilstein’s test
     c) Silver nitrate test
     d) Dumas test
     Answer: a) Sodium fusion test
191. What is the key factor in the determination of the molecular formula from the empirical formula?
     a) The percentage composition of elements in the compound
     b) The molecular weight of the compound
     c) The boiling point of the compound
     d) The solubility in water
     Answer: b) The molecular weight of the compound
192. Which of the following is NOT a principle of differential extraction?
     a) Separation of substances based on solubility differences
     b) Utilization of two immiscible solvents
     c) Separation of substances based on their boiling points
     d) Repeated extraction for higher purity
     Answer: c) Separation of substances based on their boiling points
193. Which of the following methods is used for the purification of volatile liquids?
     a) Sublimation
     b) Distillation
     c) Crystallization
     d) Chromatography
     Answer: b) Distillation
194. What is the purpose of performing a sodium fusion test in qualitative analysis?
     a) To detect the presence of nitrogen and halogens
     b) To estimate the boiling point of the compound
     c) To detect the purity of the compound
     d) To test for the presence of alkali metals
     Answer: a) To detect the presence of nitrogen and halogens
195. The quantitative estimation of carbon in an organic compound is based on which method?
     a) Lassaigne’s test
     b) Dumas method
     c) Lujohar’s method
     d) Kjeldahl method
     Answer: b) Dumas method

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