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Uttarakhand PMT Uttarakhand PMT Solved Paper-2007

  • question_answer
    A compound contains 69.5% oxygen and 30.5% nitrogen and its molecular weight is 92. The formula of the compound is

    A) \[{{N}_{2}}O\]          

    B)  \[N{{O}_{2}}\]

    C)  \[{{N}_{2}}{{O}_{4}}\]         

    D)  \[{{N}_{2}}{{O}_{5}}\]

    Correct Answer: C

    Solution :

     
    Element % %/At. Wt. Ratio
    N 30.5 30.5/14=2.18 1
    O 69.5 69.5/16=4.34 2
    Empirical formula\[=N{{O}_{2}}\] Empirical formula weight = 46 \[\therefore \] \[n=\frac{92}{46}=2\] Hence, mol. Formula\[={{N}_{2}}{{O}_{4}}\]


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