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Question

The ionic radii of A+ and B ions are 0.98×1010 m and 1.81×1010 m. The coordination number of each ion in AB is:
(NEET 2016)

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Solution

Radius ratio of (A+B)=0.98×1010 m1.81×1010 m=0.981.81=0.541

If the radius ratio is between 0.414 and 0.732 then, coordination number is 6.
Radius ratio Type of void occupied Coordination number
< 0.155 Linear void 2
0.155 to 0.225 Planar Triangular void 3
0.225 to 0.414 Tetrahedral void 4
0.414 to 0.732 Octahedral void 6
0.732 to 1 Body centred cubic void 8

Hence, option (a) is correct.

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