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AIIMS 2006
Exam
AIIMS
Year
2006
Subject
Chemistry
Chapter
Solid State

AIIMS 2006 · Chemistry · Solid State

The Ca^ 2+ and F^ - are located in CaF_2 crystal, respectively at...

The Ca2+\mathrm{Ca}^{2+} and F−\mathrm{F}^{-}are located in CaF2\mathrm{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

In CaF2\mathrm{CaF}_2 crystal, the Ca2+\mathrm{Ca}^{2+} ions are present at all corners and at the centre of each face of the cube and the F−\mathrm{F}^{-}ions occupy all the tetrahedral sites.
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