ChemistryHardHigh School (11–12)Organic Chemistry: Some Basic Principles and Techniques › Purification and Analysis of Organic CompoundsNEET
Created by StemPy LabMatch each job in List-I with the method of purification that NCERT gives for it in List-II. List-I (Job) A. Taking an organic compound out of water by shaking with a solvent that does not mix with water B. Purifying a solid that dissolves little in a solvent when cold but readily when hot C. Separating glycerol from spent-lye in the soap industry D. Separating aniline from a mixture of aniline and water List-II (Method) I. Crystallisation II. Steam distillation III. Differential extraction IV. Distillation under reduced pressure
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← The figure shows two laboratory set-ups, X and Y, used to purify organic liquids. Two statements about them are given below.
Statement I: Set-up X is used when the liquids of a mixture boil at close temperatures, as for the fractions of crude oil; the higher boiling part condenses in the column and runs back.
Statement II: In set-up Y, the organic liquid distils over only when the flask reaches the boiling point of that liquid, because the steam only brings heat into the flask.In Kjeldahl's method, the ammonia from 0.300 g of an organic compound is passed into 25.0 mL of 0.500 mol L⁻¹ sulphuric acid. The acid left over is neutralised by 40.0 mL of 0.500 mol L⁻¹ sodium hydroxide. The compound has no nitro or azo group and no nitrogen in a ring. Take N as 14 g mol⁻¹. What is the percentage of nitrogen in the compound? →
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