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The curves below represent the variation of temperature with time when pure and impure samples of a solid were heated separately.
ChemForm4Term1OpPP2Q1

  1. Which curve shows the variation in temperature for the pure solid? Explain. 
  2. State the effect of impurities on the melting and boiling points of a pure substance.
    • Melting points 
    • Boilling points 

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  1. Sharp/ constant melting point and boiling point.
  2.   
    • Melting points  - lower the M.P 
    • Boilling points  - raises the b.p
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