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NTA Abhyas 2020

Exam: NTA Abhyas
Year: 2020
Subject: Chemistry
Chapter: Solid State

NTA Abhyas 2020 · Chemistry · Solid State

What are the coordination number (C.N.) of Ca^ 2 + and F^ - ion in...

What are the coordination number (C.N.)

of Ca^{2 +} and F^{-}

ion in calcium fluoride

\left(Ca{F}_{2}\right)

crystal structure?

Options

AC.N. of $Ca^{2 +} = 4$ and $F^{-} = 8$
BC.N. of $Ca^{2 +} = 6$ and $F^{-} = 6$
CC.N. of $Ca^{2 +} = 8$ and $F^{-} = 8$
DC.N. of $Ca^{2 +} = 8$ and $F^{-} = 4$

Correct answer

D. C.N. of $Ca^{2 +} = 8$ and $F^{-} = 4$

Step-by-step solution

Each

Ca^{2 +}

ion is surrounded by 8

F^{-}

ions and each

F^{-}

ion by 4

Ca^{2 +}

ions. Thus, coordination number of

Ca^{2 +}

is 8 and

F^{-}

is 4.

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