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JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Self Evaluation Test - Some Basic Concepts of Chemistry

  • question_answer
    The ppm level of \[{{F}^{-}}\] in a 500 g sample of a tooth paste containing \[0.2g\text{ }{{F}^{-}}\] is

    A) 400  

    B) 1000 

    C) 250                  

    D) 200

    Correct Answer: A

    Solution :

    [a] \[ppm=\frac{wt.\,of\,solute}{wt.\,of\,solvent}\times {{10}^{6}}\] \[=\frac{0.2}{500}\times {{10}^{6}}=400\]                 


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