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In zinc blende $(ZnS)$ , distance between two closest ${Zn}^{2 +}$ ions is $5 \overset{\circ}{A}$ then distance between two next closest $S^{2 -}$ ions is -

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Important Questions on Solid State

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Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

The arrangement of X^- ions around A⁺ ion in solid AX is given in the figure (not drawn to scale). If the radius of X^- is 250 pm, the radius of A⁺ is

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Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

The ionic radii of

A^{+}

and

B^{-}

ions are

0.98 \times 10^{- 10} m

and

1.81 \times 10^{- 10} m

. The coordination number of each ion in AB is

EASY

Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

A unit cell of calcium fluoride has four calcium ions. The number of fluoride ions in the unit cell is

HARD

Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

Consider an ionic solid

MX

, with

NaCl

structure. Construct a new structure

(Z)

, whose unit cell is constructed from the unit cell of

MX

, following the sequential instructions given below. Neglect the charge balance.

(i)

Remove all the anions

(X)

, except the central one.

(ii)

Replace all the face centered cations

(M)

, by anions

(X)

(iii)

Remove all the corner cations

(M)

(iv)

Replace the central anion

(X)

, with cation

(M)

.

The value of

(\frac{n u m b e r o f a n i o n s}{n u m b e r o f c a t i o n s})

Z

is _____.

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Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

If the edge length of a body centred unit cell is

400 pm,

what will be the approximate radius of the atom present in it? (in pm)

EASY

Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

What are the coordination numbers (C.N.) of

{Ca}^{2 +}

and

F^{-}

ion in calcium fluoride

({CaF}_{2})

crystal structure ?

EASY

Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion

(C a^{2 +})

and fluoride ion

(F^{-})

are

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Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

How many Bravais lattices are possible in a crystal?

HARD

Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

Number of unit cells present in a cubic shaped ideal crystal of

NaCl

of mass

1.00 g

is [Molecular mass

= 58.5

]

MEDIUM

Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

Ionic radii of cation

A^{+}

and anion

B^{-}

are

102

and

181 pm

respectively. These ions are allowed to crystallize into an ionic solid. This crystal has cubic close packing for

B^{-} . A^{+}

is present in all octahedral voids. The edge length of the unit cell of the crystal

AB

is___

pm

EASY

Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

The fraction of voids occupied in the inverse spinel compounds are

EASY

Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

What is the value of radius ratio of ionic crystal having coordination number six?

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Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

A compound

M_{p} X_{q}

has cubic close packing (

ccp

) arrangement of

X

. Its unit cell structure is shown below. The empirical formula of the compound is

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EASY

Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

CsCl

crystallises in body centred cubic lattice. If 'a' is its edge length then which of the following expressions is correct?

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Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

In a compound, atoms of element

Y

form

ccp

lattice and those of element

X

occupy

\frac{2}{3}

of tetrahedral voids. The formula of the compound will be

EASY

Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

What is the co-ordination number of

{Cl}^{-}

NaCl

crystal ?

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Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

The radius of

K^{+}

133 pm

and that of

{Cl}^{-}

181 pm

. The volume of the unit cell of

KCl

expressed in

10^{- 22} {cm}^{3}

is:

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Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

A solid XY has NaCl structure. If radius of

X^{+}

is 100 pm. What is the radius of

Y^{-}

ion:

EASY

Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

In a hypothetical solid, C atoms are found to form cubical close packed lattice. A atoms occupy all tetrahedral voids and B atoms occupy all octahedral voids. A and B atoms are of appropriate size, so that there is no distortion in CCP lattice of C atoms. Now if a plane as shown in the following figure is cut. Then the cross section of this plane will look like

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Chemistry>Physical Chemistry>Solid State>Packing in Voids of Ionic Solids

For an ionic crystal of the general formula AX and coordination number 6, the value of radius ratio will be

In zinc blende (ZnS), distance between two closest Zn2+ ions is 5A∘ then distance between two next closest S2- ions is -

Important Questions on Solid State

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In zinc blende $(ZnS)$ , distance between two closest ${Zn}^{2 +}$ ions is $5 \overset{\circ}{A}$ then distance between two next closest $S^{2 -}$ ions is -