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How will you distinguish between the following pairs of terms?

Hexagonal close packing and cubic close packing.

Important Questions on The Solid State

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

NaCl

is a

FCC

lattice where

{Na}^{+}

ions are at corner and face centre positions. Chloride ions are at edge centres and body centre positions. How many

NaCl

formula units will be in an unit cell

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

If the angle of incidence of X-ray of wavelength

3 Å

which produces a second order diffracted beam from the

(100)

planes in a simple cubic lattice with interlayer spacing

a = 6 Å i s 30^{o},

the angle of incidence that produces a first - order diffracted beam from the

(200)

planes is

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

The cubic unit cell structure of a compound containing cation $M$ and anion $X$ is shown below. When compared to the anion, the cation has smaller ionic radius. Choose the correct statement(s).

Question Image

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

A match box exhibits

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

The number of voids in

1

mole of a compounds forming a

hcp

structure are

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

The

FCC -

crystal contains how many atoms in each unit cell?

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

In a face centered cubic lattice atoms A are at the corner points and atoms B at the face centered points. If atom B is missing from one of the face centered points, the formula of the ionic compound is :

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

A metallic element has a cubic lattice. Each edge of the unit cell is

2 \overset{\overset{'}{°}}{A}

. The density of the metal is

2.5 g {cm}^{- 3}

. The unit cell in

200 g

of the metal are

EASY

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

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

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

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

Polonium (atomic mass

= 209

) crystallises in a simple cubic structure with a density of

9.32 g {cm}^{- 3}

. Its lattice parameter (in

pm

) is closest to

EASY

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

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

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

(a) Aluminium crystallizes in a cubic close-packed structure. Its metallic radius is $125 pm$ . What is the length of the side of the unit cell?

(b) Why is potassium chloride sometimes violet instead of pure white?

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

The correct option for the number of body centred unit cells in all

14

types of Bravais lattice unit cells is:

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

What is the number of atoms in end centered unit cell?

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

Define Unit cell and Paramagnetic substance.

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

How many Bravais lattices are possible in a crystal?

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

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

0.5

mole of the crystal is

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

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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The ratio $r = b / a$ for which the packing fraction is minimized is closest to:

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

In a compound, atoms of elements

Y

form ccp lattice and those of element

X

occupy

2 / 3 rd

of tetrahedral voids. The formula of the compound can be

How will you distinguish between the following pairs of terms? Hexagonal close packing and cubic close packing.

Important Questions on The Solid State

Learn and Prepare for any exam you want !

How will you distinguish between the following pairs of terms?

Hexagonal close packing and cubic close packing.