Cesium chloride crystallizes in cubic unit cell with Cl ⊖ ions at the corners and a Cs ⊕ ion in the centre of the cube. How many CsCl molecules are there in the unit cell?

A BCC unit cell has atoms at each corner of the cube and an atom at the centre of the structure. According to this structure, the atom at the body centre wholly belongs to the unit cell in which it is present. In BCC unit cell every corner has atoms. There is one atom present at the centre of the structure. BCC describes the structure of CsCl . So, a cubic cell has the following number of atoms, 8 × 1 8 + 1 = 2 . In the CsCl crystal, each unit cell has 2 atoms.

E M B I B E

Chemistry Standard 12>Chapter 1 - Solid State>Exercises>Q 3

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IMPORTANT

Earn 100

What are paramagnetic substances? Give examples.

Important Questions on Solid State

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12th Maharashtra Board

IMPORTANT

Chemistry Standard 12>Chapter 1 - Solid State>Exercises>Q 3

What are the consequences of Schottky defect?

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IMPORTANT

Chemistry Standard 12>Chapter 1 - Solid State>Exercises>Q 3

Cesium chloride crystallizes in cubic unit cell with

{Cl}^{⊖}

ions at the corners and a

{Cs}^{\oplus}

ion in the centre of the cube. How many

CsCl

molecules are there in the unit cell?

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Chemistry Standard 12>Chapter 1 - Solid State>Exercises>Q 3

Cu

crystallizes in fcc unit cell with edge length of

495 pm

. What is the radius of

Cu

atom?

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IMPORTANT

Chemistry Standard 12>Chapter 1 - Solid State>Exercises>Q 3

Obtain the relationship between density of a substance and the edge length of unit cell.

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12th Maharashtra Board

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Chemistry Standard 12>Chapter 1 - Solid State>Exercises>Q 4

The density of iridium is

22.4 g / {cm}^{3}

. The unit cell of iridium is fcc. Calculate the radius of iridium atom. Molar mass of iridium is

192.2 g / mol

.

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12th Maharashtra Board

IMPORTANT

Chemistry Standard 12>Chapter 1 - Solid State>Exercises>Q 5

Aluminium crystallizes in cubic close packed structure with $a = 353.6 pm$ . What is the radius of $Al$ atom? How many unit cells are there in $1.00 {cm}^{3}$ of $Al ?$