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If the radius of an octahedral void and that of atom in close packing is $r & R$ respectively then relation between $r & R$ is :-

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Important Questions on Solid State

MEDIUM

Chemistry>Physical Chemistry>Solid State>Packing in Solids

Ga

(atomic mass

70 u

) crystallizes in a hexagonal close packed structure. The total number of voids in

0.581 g

Ga

is ________

\times 10^{21}

. (Round off to the Nearest Integer).

MEDIUM

Chemistry>Physical Chemistry>Solid State>Packing in Solids

A crystal is made up of metal ions

' M_{1}'

and

' M_{2}'

and oxide ions. Oxide ions form a ccp lattice structure. The cation

' M_{1}'

occupies

50 %

of octahedral voids and the cation

' M_{2}'

occupies

12.5 %

of tetrahedral voids of oxide lattice. The oxidation numbers of

' M_{1}'

and

' M_{2}'

are respectively :

EASY

Chemistry>Physical Chemistry>Solid State>Packing in Solids

The number of octahedral voids per lattice site in a lattice is_. (Rounded off to the nearest integer)

MEDIUM

Chemistry>Physical Chemistry>Solid State>Packing in Solids

What is the number of octahedral void(s) per atom present in a cubic close-packed structure ?

HARD

Chemistry>Physical Chemistry>Solid State>Packing in Solids

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

EASY

Chemistry>Physical Chemistry>Solid State>Packing in Solids

A crystalline solid is made up of

X

and

Y

atoms,

X

atoms possesses CCP structure and

Y

atoms are arranged in tetrahedral voids. If all the atoms situated on a diagonal of one side are removed, what will be the molecular formula of the crystalline solid?

HARD

Chemistry>Physical Chemistry>Solid State>Packing in Solids

In a cubic closed packed structure of mixed oxide, the oxide ions are in CCP arrangement.

\frac{1}{6}

of tetrahedral voids are occupied by cations

A

and

\frac{1}{2}

of octahedral voids are occupied by cations

B

. The formula of the oxide is

MEDIUM

Chemistry>Physical Chemistry>Solid State>Packing in Solids

The edge length of a solid possessing cubic unit cell is $2 \sqrt{2} r$ (structure I), based on hard sphere model, which upon subjecting to a phase transition, a new cubic structure (structure II) having an edge length of $\frac{4 r}{\sqrt{3}}$ is obtained, where $r$ is the radius of the hard sphere. Which of the following statements is true ?

MEDIUM

Chemistry>Physical Chemistry>Solid State>Packing in Solids

An element has a face-centered cubic

(fcc)

structure with a cell edge of

a

. The distance between the centres of two nearest tetrahedral voids in the lattice is

MEDIUM

Chemistry>Physical Chemistry>Solid State>Packing in Solids

A compound is formed by cation

C

and anion

A

. The anions form hexagonal close packed (hcp) lattice and the cations occupy

75 %

of octahedral voids. The formula of the compound is:

EASY

Chemistry>Physical Chemistry>Solid State>Packing in Solids

Right option for the number of tetrahedral and octahedral voids in hexagonal primitive unit cell are:

EASY

Chemistry>Physical Chemistry>Solid State>Packing in Solids

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

MEDIUM

Chemistry>Physical Chemistry>Solid State>Packing in Solids

The empirical formula for a compound with a cubic close packed arrangement of anions and with cations occupying all the octahedral sites in

A_{x} B .

The value of

x

is (Integer answer)

MEDIUM

Chemistry>Physical Chemistry>Solid State>Packing in Solids

In a binary compound, atoms of element

A

form a hcp structure and those of element

M

occupy

2 / 3

of the tetrahedral voids of the hcp structure. The formula of the binary compound is:

MEDIUM

Chemistry>Physical Chemistry>Solid State>Packing in Solids

In CCP arrangement, the total number of octahedral voids are _________

EASY

Chemistry>Physical Chemistry>Solid State>Packing in Solids

A two-dimensional solid pattern formed by two different atoms

X

and

Y

is shown below. The black and white squares represent atoms

X

and

Y

, respectively. The simplest formula for the compound based on the unit cell from the pattern is

Question Image

MEDIUM

Chemistry>Physical Chemistry>Solid State>Packing in Solids

Atoms of element

X

form

hcp

lattice and those of element

Y

occupy

\frac{2}{3}

of its tetrahedral voids. The percentage of element

X

in the lattice is (Nearest integer)

HARD

Chemistry>Physical Chemistry>Solid State>Packing in Solids

An element crystallises in a face–centred cubic (fcc) unit cell with cell edge a. The distance between the centres of two nearest octahedral voids in the crystal lattice is:

MEDIUM

Chemistry>Physical Chemistry>Solid State>Packing in Solids

The total number of octahedral void (s) per atom present in a cubic close packed structure is :

EASY

Chemistry>Physical Chemistry>Solid State>Packing in Solids

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?

If the radius of an octahedral void and that of atom in close packing is r & R respectively then relation between r & R is :-

Important Questions on Solid State

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If the radius of an octahedral void and that of atom in close packing is $r & R$ respectively then relation between $r & R$ is :-