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In a $NaCl$ structure, if positions of $Na$ atoms and $Cl$ atoms are interchanged, then in the new unit cell

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Important Questions on Solid State

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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

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

MEDIUM

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)

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

What is the ratio of octahedral holes to the number of anions in hexagonal closed packed structure?

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

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

NaCl

of mass

1.00 g

is [Molecular mass

= 58.5

]

EASY

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

What is the co-ordination number of

{Cl}^{-}

NaCl

crystal ?

MEDIUM

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

MEDIUM

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

Question Image

MEDIUM

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:

EASY

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

ZnS

crystal,

{Zn}^{2 +}

ions occupy _____ void.

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 _____.

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

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

(C a^{2 +})

and fluoride ion

(F^{-})

are

MEDIUM

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

MEDIUM

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

A binary solid

(A^{+} B^{-})

has a zinc blende structure with

B^{-}

ions constituting the lattice and

A^{+}

ions occupying 25% tetrahedral holes. The formula of solid is:

EASY

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

If radius of anion is 0.20 nm, the maximum radius of cations which can be filled in respective voids are correctly matched in:

MEDIUM

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

The number of unit cells in

58.5 g of NaCl

is approximately

EASY

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

Which of the following statement is not true about

NaCl

structure?

In a NaCl structure, if positions of Na atoms and Cl atoms are interchanged, then in the new unit cell

Important Questions on Solid State

Learn and Prepare for any exam you want !

In a $NaCl$ structure, if positions of $Na$ atoms and $Cl$ atoms are interchanged, then in the new unit cell