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JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Atomic Molecular and Equivalent masses

  • question_answer
    The element whose a atom has mass of \[10.86\times {{10}^{-26}}\]kg is

    A)                 Boron    

    B)                 Calcium

    C)                 Silver     

    D)                 Zinc

    Correct Answer: D

    Solution :

               1 atom has mass \[=10.86\times {{10}^{-26}}kg\]                                       \[=10.86\times {{10}^{-23}}gm\]                    \[6.023\times {{10}^{23}}\]atoms has mass  =\[10.86\times {{10}^{-23}}\times 6.023\times {{10}^{23}}\] = \[65.40gm\]                                                                      This is the atomic weight of Zn.


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