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BCECE Engineering BCECE Engineering Solved Paper-2013

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

    A) 100 amu         

    B)        96 amu

    C)        60 amu          

    D)        30 amu

    Correct Answer: B

    Solution :

    \[M{{S}_{2}}\equiv 2D\] 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            \[M\approx 160-64\] or            \[M\simeq 96\]


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