XYcrystallizes in a bcc lattice in which the radius ofX04A If all theXions are removed and another cationZis inserted what should be the maximum radius of the cationZto crystallize in a fcc lattice withY

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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

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

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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

A match box exhibits

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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

(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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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

Define Unit cell and Paramagnetic substance.

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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

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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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

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

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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

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

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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

Differentiate between primitive unit cell and centred unit cell.

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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

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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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

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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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

Which type of crystal system has axial angles

α = β = γ = 90 °

?

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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

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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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

Which of the following is an example for orthorhombic crystal?

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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

How many Bravais lattices are possible in a crystal?

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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

Which of the following lattices has the highest packing efficiency? (assuming that atoms are touching each other).

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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

For a body-centered cubic structure with unit cell edge length of $a$, the radius of the sphere of each atom is

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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

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

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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

The

FCC -

crystal contains how many atoms in each unit cell?

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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

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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Physical Sciences>Matter and Its Interactions>Develop models to describe the atomic composition of simple molecules and extended structures.>Structure and Properties of Matter - Substances are made from different types of atoms, which combine with one another in various ways. Atoms form molecules that range in size from two to thousands of atoms.

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

$X^{+} Y^{-}$ crystallizes in a bcc lattice in which the radius of $X^{+} = 0 .4 \overset{\circ}{A}$ . If all the $X^{+}$ ions are removed and another cation $Z^{+}$ is inserted, what should be the maximum radius of the cation $Z^{+}$ to crystallize in a fcc lattice with $Y^{-}$ ?

Important Questions on Develop models to describe the atomic composition of simple molecules and extended structures.

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X+Y− crystallizes in a bcc lattice in which the radius of X+=0.4A∘. If all the X+ ions are removed and another cation Z+ is inserted, what should be the maximum radius of the cation Z+to crystallize in a fcc lattice with Y−?

Important Questions on Develop models to describe the atomic composition of simple molecules and extended structures.

Learn and Prepare for any exam you want !

$X^{+} Y^{-}$ crystallizes in a bcc lattice in which the radius of $X^{+} = 0 .4 \overset{\circ}{A}$ . If all the $X^{+}$ ions are removed and another cation $Z^{+}$ is inserted, what should be the maximum radius of the cation $Z^{+}$ to crystallize in a fcc lattice with $Y^{-}$ ?