In antifluorite structure, co-ordination number of anion is:

4

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6

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8

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12

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Solution

The correct option is C $8$
Antiflourite structure has FCC packing of anions.

All tetrahedral sites are filled with cations. The coordination number of cations is $4$ and that of anions is $8$ .

The chemical formula is of the type $M_{2} X$ .

Example: $L i_{2} O$

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Similar questions

Q. Ions are the constituent particles of ionic solid. Such solids are formed by the three-dimensional arrangement of cations and an ions bounded by strong coulombic forces. These solids are hard and brittle in nature. They have high melting and boiling point. Some information are given in List - I and List - II, match the List-I with List-II

List-I	List-II
(I) Co-ordination number of $C a^{2 +} and F^{-}$ in fluorite structure	(P) 8, 4
(II) Co-ordination number of $Z n^{2 +} and S^{2 -}$ in zinc blende structure	(Q) 8, 8
(III) Co-ordination number of $C s^{+} and C l^{-}$ in CsCl (bcc type) structure	(R) 4, 8
(IV) Co-ordination number of $L i^{+} and O^{2 -}$ in antifluorite structure	(S) 4, 4

Which of the following option has the correct combination considering List-I and List-II

List -I	List II
(I) Co-ordination number of $C a^{2 +} and F^{-}$ in fluorite structure	(P) 8, 4
(II) Co-ordination number of $Z n^{2 +} and S^{2 -}$ in zinc blende structure	(Q) 8, 8
(III) Co-ordination number of $C s^{+} and C l^{-}$ in $C s C l$ (bcc type) structure	(R) 4, 8
(IV) Co-ordination number of $L i^{+} and O^{2 -}$ in antifluorite structure	(S) 4, 4

Which of the following option has the correct combination considering List-I and List-II

Q. Give the total score of the correct statements of the following.

	Statements	Score
a.	In an antifluorite structure, cations are present in all tetrahedral voids.	$1$
b.	If the radius of cation is $0.35$ pm and that of anion is $0.95$ pm, then the co-ordination number of the crystal is $4$ .	$2$
c.	An atom or ion is transfered from a lattice site to an interstitial position in Frenkel defect.	$3$
d.	The density of a crystal always decreases in point defects.	$4$

Column 1: Type of structure, Column 2: Co-ordination number of cation, Column 3: Co-ordination number of anion.

$\begin{matrix} Column 1 & Column 2 & Column 3 (I) & FCC & (i) & 12 & (P) & 4 (II) & Anti-Flourite & (ii) & 6 & (Q) & 12 (III) & BCC & (iii) & 8 & (R) & 8 (IV) & Flourite & (iv) & 4 & (S) & 6 \end{matrix}$

The only correct combination for $C a F_{2}$ is:

Assertion:

6 : 6

co-ordination at normal temperature and pressure changes to

8 : 8

co-ordination at high pressure.

Reason: Pressure influences the structure of solids.

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In antifluorite structure, co-ordination number of anion is:

The correct option is C 8Antiflourite structure has FCC packing of anions.All tetrahedral sites are filled with cations. The coordination number of cations is 4 and that of anions is 8.The chemical formula is of the type M2X.Example: Li2O

The correct option is C $8$
Antiflourite structure has FCC packing of anions.

All tetrahedral sites are filled with cations. The coordination number of cations is $4$ and that of anions is $8$ .

The chemical formula is of the type $M_{2} X$ .

Example: $L i_{2} O$