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Manipal Medical Manipal Medical Solved Paper-2002

  • question_answer
    The molecular formula of cryollite is:

    A)  \[N{{a}_{2}}F.Al{{F}_{6}}\]       

    B)  \[N{{a}_{3}}Al{{F}_{6}}\]

    C)  \[N{{a}_{3}}Al{{F}_{5}}\]        

    D)  \[N{{a}_{2}}Al{{F}_{3}}\]

    Correct Answer: B

    Solution :

     The molecular formula of cryollite is\[N{{a}_{3}}Al{{F}_{6}}\].
    Element Mass Percentage Mass Ratio Simplest Ratio
    C 24 40 40/12=3.33 3.33/3.33=1
    H 4 6.66 6.66/1=6.66 6.66/3.33=2
    O 32 53.33 53.33/16=3.33 3.33/3.3=1
    Hence empirical formula\[=C{{H}_{2}}O\]


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