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JEE Main & Advanced JEE Main Paper (Held On 19 May 2012)

  • question_answer
    Ammonium chloride crystallizes in a body centred cubic lattice with edge length of unit cell of 390 pm. If the size of chloride ion is 180 pm, the size of ammonium ion would be     JEE Main  Online Paper (Held On 19  May  2012)

    A) 174pm                 

    B)                        158pm

    C)                        142pm                 

    D)                        126pm

    Correct Answer: B

    Solution :

                    For bcc structure Interionic distance \[={{r}^{+}}+{{r}^{-}}=\frac{\sqrt{3}}{2}a\] (a = edge length) \[r_{NH_{4}^{+}}^{+}+r_{C{{l}^{-}}}^{-}=\frac{\sqrt{3}}{2}a\] \[r_{NH_{4}^{+}}^{+}+180=\frac{\sqrt{3}}{2}\times 390\] \[r_{NH_{4}^{+}}^{+}=338pm-180pm=158pm\]


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