ChemistryHardHigh School (11–12)Organic Chemistry: Some Basic Principles and Techniques › Purification and Analysis of Organic CompoundsNEETJEE Main
Created by StemPy LabIn Kjeldahl's method, the ammonia from of an organic compound is passed into of sulphuric acid. The acid left over is neutralised by of sodium hydroxide. The compound has no nitro or azo group and no nitrogen in a ring. Take N as . What is the percentage of nitrogen in the compound?
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← Match 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 pressureA student separates a mixture by column chromatography and checks the fractions by thin layer chromatography. Two statements about these methods are given below.
Statement I: In column chromatography, the component that is adsorbed most strongly on the alumina or silica gel moves fastest down the column and is collected first.
Statement II: Spots of colourless compounds on a thin layer plate can be seen under ultraviolet light, or by putting the plate in a covered jar with a few crystals of iodine. →
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