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Haryana PMT Haryana PMT Solved Paper-2002

  • question_answer
    Sodium  metal  crystallises  at  room temperature in a body centered cubic lattice with a cell edge \[a=4.29\overset{\text{o}}{\mathop{\text{A}}}\,\]. The radius of sodium atom is:

    A)  \[1.40\]                              

    B)  \[2.65\]

    C)  \[1.85\]                              

    D)  \[2.15\]

    Correct Answer: C

    Solution :

                    For body-centered cubic (bcc) lattice radius   \[(r)=\frac{\sqrt{3}}{4}a=0.433a\] Therefore, radius of \[N{{a}^{+}}=0.433\times 4.29\]                                                 \[=1.8575\]


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