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Chemistry CH 2: Experimental Techniques

Quiz by edkasa chemistry

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10 questions
Show answers
  • Q1
    What is Rf value? Why it has no units?(
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    300s
  • Q2
    Define distribution law and how is it helpful in solvent extraction?
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    300s
  • Q3
    Give 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 solvents
    300s
  • Q4
    Define chromatography. Give its two uses.
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    300s
  • Q5
    During the crystallization, the hot saturated solution is
    is evaporated to get the crystals of product
    cool at a moderate rate to get medium size crystals
    Cold very slowly to get large size crystals
    Is mixed with immiscible liquid to get the crystals of product
    300s
  • Q6
    Solvent extraction is an equilibrium process and is controlled by
    Law of mass action
    the amount of solute
    the amount of solvent used
    distribution law
    300s
  • Q7
    The comparative rates at which the solutes move in paper chromatography depends on
    The size of paper used
    their Rf value
    size of the chromatographic tank
    The temperature of the experiment
    300s
  • Q8
    Solvent extraction method is particularly useful technique for separation when the product to be separated is
    Non volatile or thermally stable
    Non volatile or thermally unstable
    volatile or thermally stable
    volatile or thermally unstable
    300s
  • Q9
    Gooch crucible is made of
    Teflon
    proclain
    paper
    Glass
    300s
  • Q10
    The drying agent used in dessicator
    NH4Cl
    P2O5
    AlCl3
    Ag Cl
    300s

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