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

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Important Questions on Solid State

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Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

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>Structure of Ionic Compounds

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

MEDIUM

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

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>Structure of Ionic Compounds

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

EASY

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

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

MEDIUM

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

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>Structure of Ionic Compounds

What is the co-ordination number of

{Cl}^{-}

NaCl

crystal ?

HARD

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

If the unit cell of a mineral has cubic close packed (ccp) array of oxygen atoms with m fraction of octahedral holes occupied by aluminium ions and n fraction of tetrahedral holes occupied by magnesium ions, m and n, respectively, are

MEDIUM

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

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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MEDIUM

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

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>Structure of Ionic Compounds

ZnS

crystal,

{Zn}^{2 +}

ions occupy _____ void.

HARD

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

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>Structure of Ionic Compounds

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

HARD

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

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>Structure of Ionic Compounds

The fraction of voids occupied in the inverse spinel compounds are

EASY

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

An ionic compound is formed between a metal M and non-metal

Y.

M

occupies half the octahedral voids in the cubic close - packed arrangement formed by

Y,

the chemical formula of the ionic compound is

EASY

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

A compound of formula

A_{2} B_{3}

has the HCP lattice. Which atom forms the HCP lattice and what fraction of the tetrahedral voids are occupied by the other atoms?

EASY

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

CsCl

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

EASY

Chemistry>Physical Chemistry>Solid State>Structure of Ionic Compounds

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>Structure of Ionic Compounds

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

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

Important Questions on Solid State

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