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WB JEE Medical WB JEE Medical Solved Paper-2009

  • question_answer
    An organic compound made of C, H and N contains 20% nitrogen. Its molecular weight is

    A)  70                                         

    B)  140

    C)  100                                       

    D)  65

    Correct Answer: A

    Solution :

                                    Atomic mass of nitrogen = 14 Since the compound contains C, H and N, al least one N atom must be there in the molecule \[\because \]     \[20%\,N=14\] \[\therefore \]  \[100%=\frac{14}{20}\times 100=70\] \[\therefore \]The minimum molecular weight of the organic compound = 70


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