Q:
      
      
         
            
Which of the following is not a pure substance?
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: D) Milk         
         
Explanation: Milk is not a pure substance since it has so many constituents that can be separated physically.
Compounds are pure substances formed from elements unlike mixtures.
       
      
      
      
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