The Ca^ 2+ and F^ - are located in CaF_2 crystal respectively at face-centred cubic lattice points and in

Correct answer: A. tetrahedral voids 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.

AIIMS 2015

Exam: AIIMS
Year: 2015
Subject: Chemistry
Chapter: Solid State

AIIMS 2015 · Chemistry · Solid State

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

The

\mathrm{Ca}^{2+}

and

\mathrm{F}^{-}

are located in

\mathrm{CaF}_2

crystal respectively at face-centred cubic lattice points and in

Options

Atetrahedral voids
Bhalf of tetrahedral voids
Coctahedral voids
Dhalf of octahedral voids.

Correct answer

A. tetrahedral voids

Step-by-step solution

\mathrm{CaF}_2

has

c c p

arrangement in which

\mathrm{Ca}^{2+}

ions form

\mathrm{fcc}

with each

\mathrm{Ca}^{2+}

ion surrounded by

8 \mathrm{~F}^{-}

ions and each

\mathrm{F}^{-}

ion by

4 \mathrm{Ca}^{2+}

ions.

\mathrm{F}^{-}

ions occupy all the tetrahedral voids.

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