Chemistry CH 2: Experimental Techniques
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10 questions
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- Q1What is Rf value? Why it has no units?(Users enter free textType an Answer300s
- Q2Define distribution law and how is it helpful in solvent extraction?Users enter free textType an Answer300s
- Q3Give the salient features of the ideal solvent used in the process of crystallization?(Should Dissolve maximum amount at high temperature and minimum amount at low temperature Unreactive Should not dissolve impurities Should help form crystals Inexpensive Safe to use Can be mixture of solvents300s
- Q4Define chromatography. Give its two uses.Users enter free textType an Answer300s
- Q5During the crystallization, the hot saturated solution isis evaporated to get the crystals of productcool at a moderate rate to get medium size crystalsCold very slowly to get large size crystalsIs mixed with immiscible liquid to get the crystals of product300s
- Q6Solvent extraction is an equilibrium process and is controlled byLaw of mass actionthe amount of solutethe amount of solvent useddistribution law300s
- Q7The comparative rates at which the solutes move in paper chromatography depends onThe size of paper usedtheir Rf valuesize of the chromatographic tankThe temperature of the experiment300s
- Q8Solvent extraction method is particularly useful technique for separation when the product to be separated isNon volatile or thermally stableNon volatile or thermally unstablevolatile or thermally stablevolatile or thermally unstable300s
- Q9Gooch crucible is made ofTeflonproclainpaperGlass300s
- Q10The drying agent used in dessicatorNH4ClP2O5AlCl3Ag Cl300s