Chapter 115 of 2363 min read
Purification methods: crystallisation, distillation, chromatography
Why this is asked: Steam distillation only works for a substance that's virtually insoluble in water and has some vapour pressure at 373 K — it lets something like aniline distil below its own, much higher, boiling point instead of decomposing there. In chromatography, Rf is the distance moved by the compound divided by the distance moved by the solvent front, always less than 1 — a value NEET expects you to compute, not just define.
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- •Match List I with List II.
Choose the correct answer from the options given below:List I (Mixture) List II (Method of separation) A. I. Distillation under reduced pressure B. Crude oil in the petroleum industry II. Steam distillation C. Glycerol from spent-lye III. Fractional distillation D. Aniline–water IV. Simple distillation - •On heating, some solid substances change from the solid to the vapour state without passing through the liquid state. The technique used for the purification of such solid substances, based on the above principle, is known as:
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