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

  • question_answer
    The edge length of face centred unit cubic cell is \[508\,\,pm.\] If the radius of the cation is \[110\,\,pm,\] the radius of the anion is [CBSE PMT 1998]

    A) \[285\,\,pm\]   

    B) \[398\,\,pm\]

    C) \[144\,\,pm\]   

    D) \[618\,\,pm\]

    Correct Answer: C

    Solution :

    • Distance between centres of cation and anion \[=\frac{d}{2}=\frac{508}{2}=254\,pm\]                
    • \[{{r}_{c}}+{{r}_{a}}=254\,pm\] or \[110+{{r}_{a}}=254\] or  \[{{r}_{a}}=144\,pm\]


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