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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 number of water molecules present in a drop of water (volume 0.0018 mL) density =\[18m{{L}^{-1}}\] at room temperature is

    A) \[1.084\times {{10}^{18}}\]                 

    B) \[6.023\times {{10}^{19}}\]

    C) \[4.84\times {{10}^{17}}\]      

    D) \[6.023\times {{10}^{23}}\]

    Correct Answer: B

    Solution :

    [b] \[0.0018mL=0.0018g=0.0001\] mole of water \[={{10}^{-4}}\,mole\]  \[\therefore \] Number of water molecules \[=6.023\times {{10}^{23}}\times {{10}^{-4}}=6.023\times {{10}^{19}}\]


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