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All noble gases crystallise in the ccp structure except

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Important Questions on Solid State

HARD

Chemistry>Physical Chemistry>Solid State>Packing in Solids

A material having simple cubic lattice, is heated such that

1

site out of

8

sites becomes vacant. Assuming that the volume does not change, the packing fraction

f

of the material is [packing efficiency

\equiv (100 f) %

]

MEDIUM

Chemistry>Physical Chemistry>Solid State>Packing in Solids

Atoms of element

B

form hcp lattice and those of the element

A

occupy

\frac{1}{3}

rd of tetrahedral voids. What is the formula of the compound formed by the elements

A

and

B

HARD

Chemistry>Physical Chemistry>Solid State>Packing in Solids

How will you distinguish between the following pair of term?
Hexagonal close-packing and cubic close packing?

MEDIUM

Chemistry>Physical Chemistry>Solid State>Packing in Solids

A compound is formed by two elements

X

and

Y

. Atoms of element

Y

form hexagonal close packing (hcp) lattice and those of the elements

X

occupy

(2 / 3)^{rd}

of tetrahedral voids. The formula of the compound formed by the elements

X

and

Y

MEDIUM

Chemistry>Physical Chemistry>Solid State>Packing in Solids

The number of voids in

1

mole of a compounds forming a

hcp

structure are

HARD

Chemistry>Physical Chemistry>Solid State>Packing in Solids

In a face centered cubic (fcc) lattice, the position which represents an octahedral hole is

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EASY

Chemistry>Physical Chemistry>Solid State>Packing in Solids

Draw a diagram of "two-dimension square closed packing".

HARD

Chemistry>Physical Chemistry>Solid State>Packing in Solids

A metal $M$ forms hexagonal close-packed structure. The total number of voids in $0.02 mol$ of it is _____ $\times 10^{21}$ (Nearest integer)

(Given $N_{A} = 6.02 \times 10^{23}$ )

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

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EASY

Chemistry>Physical Chemistry>Solid State>Packing in Solids

A compound made up of elements

A

and

B

(with a general formula

A_{x} B_{y}

), where

B

form a hcp lattice and A occupy

2 / 3^{rd}

of the tetrahedral voids. The formula of the compound is

HARD

Chemistry>Physical Chemistry>Solid State>Packing in Solids

A compound crystallises in a hcp arrangement. The total number of voids present in

0.5

mole of the crystal is

EASY

Chemistry>Physical Chemistry>Solid State>Packing in Solids

Atoms of an element

Z

form hexagonal closed packed

(hcp)

lattice and atoms of element

X

occupy all the tetrahedral voids. The formula of the compound is

HARD

Chemistry>Physical Chemistry>Solid State>Packing in Solids

A two dimensional solid is made by alternating circles with radius $a$ and $b$ such that the sides of the circles touch. The packing fraction is defined as the ratio of the area under the circles to the area under the rectangle with sides of length $x$ and $y .$

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