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NEET 2016
Exam
NEET
Year
2016
Subject
Chemistry
Chapter
Solid State

NEET 2016 · Chemistry · Solid State

In calcium fluoride, having the fluorite structure, the...

In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion (Ca2+)\left(C{a}^{2 +}\right) and fluoride ion (F−)\left({F}^{-}\right) are

Options

  1. A4and24and2
  2. B6and66and6
  3. C8and48and4
  4. D4and84and8

Correct answer

C. 8and48and4

Step-by-step solution

In CaF2,Ca2(+)Ca{F}_{2}, C{a}^{2\left(+\right)} has FCC arrangement and F(−){F}^{\left(-\right)} ions are present in all tetrahedral voids.

∴∴ Co-ordination numbers for Ca2(+)C{a}^{2\left(+\right)} and F(−){F}^{\left(-\right)} ions are 8and48and4.
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