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JEE Main & Advanced Chemistry The Solid State / ठोस प्रावस्था Question Bank Critical Thinking The Solid State

  • question_answer
    The pyknometric density of sodium chloride crystal is \[2.165\times {{10}^{3}}kg\,{{m}^{-3}}\] while its X-rays density is \[2.178\times {{10}^{3}}kg\,{{m}^{-3}}\]. The fraction of unoccupied sites in sodium chloride crystal is [CBSE PMT 2003]

    A) \[5.96\times {{10}^{-3}}\]            

    B) \[5.96\]

    C) \[5.96\times {{10}^{-2}}\]            

    D) \[5.96\times {{10}^{-1}}\]

    Correct Answer: A

    Solution :

    • Difference\[=2.178\times {{10}^{3}}-2.165\times {{10}^{3}}\]\[=0.013\times {{10}^{3}}\]                
    • Fraction unoccupied \[=\frac{0.013\times {{10}^{3}}}{2.178\times {{10}^{3}}}\]\[=5.96\times {{10}^{-3}}\]


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