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Dyes W,X, Y and Z were analyzed using P as the purest sample of the dye required by a chemist .the result obtained were as shown on the chromatogram below.
samples of dye on a chromatograph

  1. What names are given to the lines marked?
  2. State with a reason the most unsuitable dye for the chemist to use .

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  1.  
    1. A-Solvent front 
    2. B-Baseline  
  2.  Z 
    Z is the most impure woth 3 substances not in the pure dye
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