EASY

Earn 100

Discuss the End-centred unit cell.

Important Questions on Solid State

EASY

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

In a metallic gold crystal, there is cubic centred lattice. What is the approximate number of unit cells present in

2.0 g

of gold? Atomic weight of gold is

179

MEDIUM

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

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

MEDIUM

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

Define Unit cell and Paramagnetic substance.

MEDIUM

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

Differentiate between primitive unit cell and centred unit cell.

EASY

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

An alloy of gold ( $Au$ ) and cadmium ( $Cd$ ) crystallises with a cubic structure in which gold atoms occupy the corners and cadmium atoms fit into the face centres. What is the formula of this alloy?

EASY

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

Distinguish between Crystal Lattice and Unit Cell.

MEDIUM

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

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

HARD

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

Consider an ionic solid

MX

, with

NaCl

structure. Construct a new structure

(Z)

, whose unit cell is constructed from the unit cell of

MX

, following the sequential instructions given below. Neglect the charge balance.

(i)

Remove all the anions

(X)

, except the central one.

(ii)

Replace all the face centered cations

(M)

, by anions

(X)

(iii)

Remove all the corner cations

(M)

(iv)

Replace the central anion

(X)

, with cation

(M)

.

The value of

(\frac{n u m b e r o f a n i o n s}{n u m b e r o f c a t i o n s})

Z

is _____.

EASY

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

Number of types of orthorhombic unit cell is:

EASY

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

Explain the following: Face centered cubic cell.

HARD

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

Atoms of an element

A

form an fcc lattice, while those of element

B

occupy half of the octahedral holes. The chemical formula for the compound formed by the elements

A

and

B

EASY

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

A compound formed by elements

X

and

Y

crystallises in the cubic structure, where

X

atoms are at the corners of a cube and

Y

atoms are at the centre of the body. The formula of the compounds is

MEDIUM

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

What fraction of one edge centred octahedral void lies in one unit cell of fcc?

EASY

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

Define the following terms: Unit Cell.

MEDIUM

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

An element occurring in the

BCC

structure has

12.05 \times 10^{23}

unit cells. The total number of atoms of the element in these cells will be

EASY

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

A unit cell of calcium fluoride has four calcium ions. The number of fluoride ions in the unit cell is

EASY

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion

(C a^{2 +})

and fluoride ion

(F^{-})

are

EASY

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

Explain the following: Body centered cubic

MEDIUM

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

The

FCC -

crystal contains how many atoms in each unit cell?

HARD

Chemistry>Physical Chemistry>Solid State>Unit Cells, Two and Three Dimensional Lattices

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

Discuss the End-centred unit cell.

Important Questions on Solid State

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