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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ss042

Using the radius-ratio limits (0.225-0.414 for CN 4, 0.414-0.732 for CN 6, 0.732-1.000 for CN 8), which of the following predictions are correct? (Radii in pm.)

  1. AA cation of radius 60 with an anion of radius 181 prefers tetrahedral coordination.
  2. BA cation of radius 95 with an anion of radius 181 prefers octahedral coordination.
  3. CA cation of radius 110 with an anion of radius 140 prefers octahedral coordination.
  4. DA cation of radius 150 with an anion of radius 181 prefers cubic (CN 8) coordination.

Answer: A, B, D

Ratios: 60/181 = 0.331 (CN 4); 95/181 = 0.525 (CN 6); 110/140 = 0.786 (above 0.732, so CN 8, not 6); 150/181 = 0.829 (CN 8). Hence statements 1, 2 and 4 are correct.
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