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NEET2015ChemistrySolid StateActual

The Ca ²⁺ and F ⁻ are located in CaF ₂ crystal respectively at face-centred cubic lattice points and in

Options

  1. Atetrahedral voids
  2. Bhalf of tetrahedral voids
  3. Coctahedral voids
  4. Dhalf of octahedral voids.

Correct answer

A. tetrahedral voids

Step-by-step solution

CaF ₂ has c c p arrangement in which Ca ²⁺ ions form fcc with each Ca ²⁺ ion surrounded by 8 ~F ⁻ ions and each F ⁻ ion by 4 Ca ²⁺ ions. F ⁻ ions occupy all the tetrahedral voids.

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