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NEET Sample Paper NEET Sample Test Paper-45

  • question_answer
    Molybdenum (\[At\text{ }wt.=96\text{ }g\text{ }mo{{l}^{-1}}\]) crystallizes as bcc crystal. If density of crystal is \[10.3\,\,g/c{{m}^{3}}\], then radius of Mo atom is (use \[{{N}_{A}}=6\,\,\times \,\,{{10}^{23}}\])-

    A) 111 pm            

    B) 314 pm

    C) 135.96 pm        

    D) None of these

    Correct Answer: C

    Solution :

    \[\rho \frac{\left( \frac{m}{{{N}_{A}}}\times z \right)}{{{a}^{3}}}\,;\,\,\,10.3\,\,=\,\,\frac{\frac{96}{6\times {{10}^{23}}}\times 2}{{{a}^{3}}}\] \[a=3.1\times {{10}^{-8}}\,cm\]


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