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NEET Chemistry The Solid State / ठोस प्रावस्था Question Bank Self Evaluation Test - The Solid State

  • question_answer
    The number of unit cells in 58.8 g of \[NaCl\] is nearly

    A) \[6\times {{10}^{20}}\]    

    B) \[3\times {{10}^{22}}\]

    C) \[1.5\times {{10}^{23}}\] 

    D) \[0.5\times {{10}^{24}}\]

    Correct Answer: C

    Solution :

    [c] Number of unit cells \[=\frac{{{N}_{A}}\times Wt.\,of\,\text{s}ubstance}{M.\,Wt.\times Z}\] \[=\frac{6.023\times {{10}^{23}}\times 58.8}{58.8\times 4}=1.5\times {{10}^{23}}\]


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