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Iron crystalizes in $FCC$ with an edge length of $400 pm$ . If it contains $0.1 %$ Schottky defects, calculate its approximate density [ $AW$ of $Fe = 56 g / mol$ ]

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Important Questions on Solid State

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Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

The percentage of unoccupied volume in simple cubic cell is

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Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

Directions: Each of the following sentences in this section has a blank space and four words or group of words given after the sentence. Select the word or group of words you consider most appropriate for the blank space and indicate your response on the Answer Sheet accordingly.

Every rash driver becomes a ____ killer.

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Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

Consider the bcc unit cells of the solids $1$ and $2$ with the position of atoms as shown below. The radius of atom $B$ is twice that of atom $A .$ The unit cell edge length is $50 %$ more in solid $2$ than in $1$ . What is the approximate packing efficiency in solid $2$ ?

Question Image

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Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

An element with molar mass

2 .7 \times 10^{- 2} kg {mol}^{- 1}

forms a cubic unit cell with edge length

405 pm .

If its density is

2.7 \times 10^{3} kg m^{- 3}

, the radius of the element is approximately

\dots \dots \dots . \times 10^{- 12} m

(to the nearest integer)

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Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

100^{o} C,

copper

(C u)

has

F C C

unit cell structure with cell edge length of

x Å

. What is the approximate density of

C u

(in

g c m^{- 3}

) at this temperature?

[A t o m i c M a s s o f C u = 63.55 u]

MEDIUM

Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

The correct order of the packing efficiency in different types of unit cells is

EASY

Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

The packing efficiency of the face centered cubic (FCC), body centered cubic (BCC) and simple/primitive cubic (PC) lattices follows the order

MEDIUM

Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

The density of a solid

X

1.5 g / {cm}^{3}

250^{o} C

. If the atoms are assumed sphere of radius

2.0 A

, the percentage of solid having empty space is
(Given atomic weight of

X = 60 g {mol}^{- 1})

EASY

Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

Two sentences are given below and you are required to find the correct sentence which combines both the sentences.

Which is the correct combination of the given two sentences?

He is too tired. He could not stand.

EASY

Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

The vacant space in bcc lattice unit cell is:

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Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

In the following sentence, a blank space with four options is given. Select whichever preposition or determiner you consider the most appropriate for the blank space.

These are the good rules to live _____.

EASY

Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

Iron crystallizes in several modifications. At about

911^{o} C

, the bcc

' α'

form undergoes a transition to fcc

' γ'

form. If the distance between two nearest neighbours is the same in the two forms at the transition temperature, what is the ratio of the density of iron in fcc form

(ρ_{2})

to the iron in bcc form

(ρ_{1})

at the transition temperature?

MEDIUM

Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

A diatomic molecule

X_{2}

has a body-centred cubic

(bcc)

structure with a cell edge of

300 pm .

The density of the molecule is

6.17 {gcm}^{- 3} .

The number of molecules present in

200 g

X_{2}

is :
(Avogadro constant

(N_{A}) = 6 \times 10^{23} {mol}^{- 1}

)

MEDIUM

Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

The number of atoms in

2.4 g

of body centred cubic crystal with edge length

200 pm

is (density

= 10 g {cm}^{- 3}, N_{A} = 6 \times 10^{23} atoms {mol}^{- 1}

)

MEDIUM

Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

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

2 \dot{A}

and the density of metal is

25 g {cm}^{3}

. The unit cell in

200 g

of metal are

HARD

Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

How many number of unit cells are present in

100 g

of an element with FCC crystal having density

10 g / {cm}^{3}

and edge length

100 pm

EASY

Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

The ratio of packing efficiency in

FCC, BCC

and simple cubic structure respectively, with respect to that of

FCC

structures is

EASY

Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

Copper

(A t o m i c m a s s = 63.5)

crystallizes in a FCC lattice and has density

8 .93 g . {cm}^{- 3} .

The radius of copper atom is closest to

HARD

Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

Lithium has a bcc structure. Its density is

530 k g m^{- 3}

and its atomic mass is

6.94 g m o l^{- 1}

. Calculated the edge length of a unit cell of Lithium metal.

(N_{A} = 6.02 \times 10^{23} m o l^{- 1})

HARD

Chemistry>Physical Chemistry>Solid State>Density of Unit Cells

Iron exhibits BCC structure at room temperature. Above

900^{°} C

, it transforms to FCC structure. The ratio of the density of iron at room temperature to that at

900^{°} C

is (assuming molar mass and atomic radii of iron remains constant with temperature)

Iron crystalizes in FCC with an edge length of 400pm. If it contains 0.1% Schottky defects, calculate its approximate density [AW of Fe=56 g/mol]

Important Questions on Solid State

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Iron crystalizes in $FCC$ with an edge length of $400 pm$ . If it contains $0.1 %$ Schottky defects, calculate its approximate density [ $AW$ of $Fe = 56 g / mol$ ]