MEDIUM

Earn 100

Explain the terms isomorphism, polymorphism, anisotropy and unit cell.

Important Questions on The Solid State

MEDIUM

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

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 :

MEDIUM

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

Give two differences between Crystalline solids and Amorphous solids.

HARD

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

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

MEDIUM

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

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

14

types of Bravais lattice unit cells is:

EASY

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

Which of the following statements is true with regards to crystalline solids?

HARD

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

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

HARD

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

Which of the following statement is correct?

MEDIUM

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

(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?

MEDIUM

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

What is a vitreous state ?

HARD

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

Define Anisotropy. Distinguish between crystalline solids and amorphous solids.

MEDIUM

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

The

FCC -

crystal contains how many atoms in each unit cell?

MEDIUM

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

Select the correct statements.
(A) Crystalline solids have long range order.
(B) Crystalline solids are isotropic.
(C) Amorphous solid are sometimes called pseudo solids.
(D) Amorphous solids soften over a range of
temperatures.
(E) Amorphous solids have a definite heat of fusion. Choose the most appropriate answer from the options given below.

MEDIUM

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

A match box exhibits

HARD

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

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

MEDIUM

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

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

MEDIUM

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

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

MEDIUM

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

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

MEDIUM

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

The material that soften on heating to finally flow like a liquid is _____.

MEDIUM

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

Given below are two statements. One is labelled as
Assertion $A$ and the other is labelled as Reason $R$ .
Assertion $A :$ Sharp glass edge becomes smooth on heating it up to its melting point.

Reason $R :$ The viscosity of glass decreases on melting.

Choose the most appropriate answer from the options given below.

EASY

Chemistry>Physical Chemistry>The Solid State>Amorphous and Crystalline Solids

The amorphous form of silica is:

Explain the terms isomorphism, polymorphism, anisotropy and unit cell.

Important Questions on The Solid State

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