An ionic solid A+B-crystallizes in rock salt type structure. What is the
third nearest neighbour of anion B and how many in number?
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Coordination number of both ions in Rock Salt type unit cell is 6 hence option A and B are correct
Second nearest neighbours of cation(present in the octahedral voids) are present in the nearest octahedral void, which are 12 in number.
Based on FCC crystal (like NaCl lattice), we have
Packing fraction =a3(4×34πrA+3)+(4×34πrB−3)
=a3(4×34π(22)3a3(0.414)3)+(4×34π(22)3a3)=0.79
Hence, options A. B and C are correct while D is incorrect.
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