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BCECE Medical BCECE Medical Solved Papers-2013

  • question_answer
    A certain metal sulphide, \[M{{S}_{2}}\], is used extensively as a high temperature lubricant. If \[M{{S}_{2}}\] has 40.06 % sulphur by weight, atomic mass of M will be

    A)  100 amu 

    B)  96 amu

    C)  60 amu         

    D)  30 amu

    Correct Answer: B

    Solution :

    \[M{{S}_{2}}\text{ }\,\,\,\,\,\equiv \text{ }\,\,\,\,\,2D\] 100               40.06 M + 64               64 \[\therefore \] \[\frac{100}{M+64}=\frac{40.06}{64}\] or            \[40.06\,(M+64)=100\times 64\] or            \[M+64=\frac{6400}{40.06}\] or            \[M+64\approx 160\] or            \[M\simeq 160-64\] or \[M\simeq 96\]


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