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A solid XY has NaCl structure. If radius of X + is 100 pm . What is the radius of Y - ion:

Options

  1. A120 pm
  2. B136 .6 to 241 .6 pm
  3. C136.6 pm
  4. D241.6 pm

Correct answer

B. 136 .6 to 241 .6 pm

Step-by-step solution

For NaCl like structure. The radius ratio should be 0.414 to 0.732 r + r - = 100 r m a x - = 0.414 100 r m i n - = 0.732 ∴ r m a x - = 241.6 p m ∴ r min = 136.6 pm

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