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A unit cell of ${B a C l}_{2}$ (fluorite structure) is made up of eight ${B a}^{2 +}$ ions and four ${C l}^{-}$ ions.

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Important Questions on The Solid State

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Chemistry>Physical Chemistry>The Solid State>Close Packed Structures and Packing Efficiency

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>The Solid State>Close Packed Structures and Packing Efficiency

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 :

MEDIUM

Chemistry>Physical Chemistry>The Solid State>Close Packed Structures and Packing Efficiency

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>The Solid State>Close Packed Structures and Packing Efficiency

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

HARD

Chemistry>Physical Chemistry>The Solid State>Close Packed Structures and Packing Efficiency

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>The Solid State>Close Packed Structures and Packing Efficiency

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)

HARD

Chemistry>Physical Chemistry>The Solid State>Close Packed Structures and Packing Efficiency

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

EASY

Chemistry>Physical Chemistry>The Solid State>Close Packed Structures and Packing Efficiency

In a metallic oxide, oxide ions are arranged in cubic close packing. One-sixth of the tetrahedral voids are occupied by cations p and one-third of octahedral voids are occupied by the cation Q'. Deduce the formula of the compound'.

MEDIUM

Chemistry>Physical Chemistry>The Solid State>Close Packed Structures and Packing Efficiency

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>The Solid State>Close Packed Structures and Packing Efficiency

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:

MEDIUM

Chemistry>Physical Chemistry>The Solid State>Close Packed Structures and Packing Efficiency

A compound forms hexagonal close packed

(hcp)

structure. What is the total number of voids in

0.5 mol

of it? How many of these are tetrahedral voids?

EASY

Chemistry>Physical Chemistry>The Solid State>Close Packed Structures and Packing Efficiency

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>The Solid State>Close Packed Structures and Packing Efficiency

What is the formula of a compound in which the element

Y

forms

CCP

lattice and atoms

X

occupy

\frac{1}{3^{rd}}

of tetrahedral voids.

EASY

Chemistry>Physical Chemistry>The Solid State>Close Packed Structures and Packing Efficiency

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?

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Chemistry>Physical Chemistry>The Solid State>Close Packed Structures and Packing Efficiency

A compound is formed by two elements

M

and

N

. The element

N

forms ccp and

M

atom occupies

\frac{1}{3}

of the tetrahedral voids. The formula of the compound is

MEDIUM

Chemistry>Physical Chemistry>The Solid State>Close Packed Structures and Packing Efficiency

The number of tetrahedral voids present per atom in a cubic close packed structure is _____ .

HARD

Chemistry>Physical Chemistry>The Solid State>Close Packed Structures and Packing Efficiency

If the radius of the octahedral void is ' $r$ ' and radius of the atoms in close-packing is ' $R$ '. Derive relation between $r$ and $R$ .

HARD

Chemistry>Physical Chemistry>The Solid State>Close Packed Structures and Packing Efficiency

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>The Solid State>Close Packed Structures and Packing Efficiency

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

EASY

Chemistry>Physical Chemistry>The Solid State>Close Packed Structures and Packing Efficiency

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?

A unit cell of BaCl2 (fluorite structure) is made up of eight Ba2+ ions and four Cl- ions.

Important Questions on The Solid State

Learn and Prepare for any exam you want !

A unit cell of ${B a C l}_{2}$ (fluorite structure) is made up of eight ${B a}^{2 +}$ ions and four ${C l}^{-}$ ions.