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Ionic Compounds and Radius Ratios

if the ratio ...

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if the ratio of radius of cation and radius of anion is equal to 0.255 then in which void( trigonal or tetrahedral) will these cations accommodate?

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Q. In zinc blende structure, anions are arranged in ccp and cations are present in the tetrahedral voids and only half the tetrahedral voids are occupied.
For this type of structure, radius ratio,

\frac{r_{+}}{r_{-}}

should be in the range of

Q. There are three ionic compounds, first compound has fcc lattice of anions and cations are present in all tetrahedral voids, second compound has fcc lattice of anions and cations are present in all octahedral voids and the third compound has simple cubical lattice in which cubical void is occupied by cation, then the order of packing efficiency of these will be :

Q. An ionic solid of

X Y

type of having anions in CCP lattice and cations in the octahedral voids. Let

a

be the edge length of the FCC cube. The radius ratio of cation

(R_{+})

(R_{-})

is greater than

0.415

. Then which of the following is false?

Q. In Zinc blende structure, anions are arranged in ccp and cations are present in the tetrahedral voids and only half the tetrahedral voids are occupied.
The coordination numbers of cation and anion are __________ respectively.

Q. Match the List-I with List-II and List-III:

List-I (Solids)	List-II (Unit cell)	List-III (Coordination number)
(a) Rock salt	(p) Face-centred cubic, anion in tetrahedral void	(w) 6
(b) Fluorite	(q) Face-centred cubic, cation in octahedral void	(x) Cation (8), anion (4)
(c) Agl, ZnS	(r) Face-centred cubic, cation in alternate tetrahedral void	(y) Cation (4), anion (8)
(d) $N a_{2} O$	(s) Face-centred cubic, cation in tetrahedral void	(z) Cation (4), anion (4)

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