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9th Class Science Atoms and Molecules Question Bank Atoms and Molecules

  • question_answer
    What is the ratio of the number of atoms of elements potassium, chlorine and oxygen respectively present in \[245\,\,g\] of\[KCl{{O}_{3}}\]?

    A) \[2:2:3\]

    B)        \[1:1:3\]  

    C) \[39:36:48\]       

    D)        \[1:2:6\]

    Correct Answer: B

    Solution :

     Molecular weight of\[KCl{{O}_{3}}\].             \[=39+35.5+(16\times 3)=122.5\] \[245\,\,g\] of\[KCl{{O}_{3}}=2\]moles Ratio of number of atoms of\[K:Cl:O\]are\[1:1:3\]


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