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The arrangement ofCI^(-) ions in CsCI st...

The arrangement of`CI^(-)` ions in `CsCI` structure is

A

Hcp

B

Fcc

C

None of these

D

Simple cubic

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The correct Answer is:
D
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The tetrahedral voids formed by cup arrangement of CI^(-) ions in rock salt structure are

The tetrahedral voids formed by ccp arrangement of Cl^(-) ions in rock salt structure are:

Assertion: In the body centred cubic structure of CsCl the arrangement of Cl^(-) ions is primitive Reason: In CsCl, the Cs^(+) ion remains at the body centred position and Cl^(-) ions at the corners.

The arrangement of ions in a solid is best investigaged by means of:

In a close packed structure, the atoms stack together occupying maximum space and leaving minimum vacant space. The close packing arrangment may be hcp (ABABA….) or ccp (ABCABCA….). In these arrangments, there is one octahedral void and two tetrahedral voids. Depending upon the ratio of size of cation and anion, the ions of one type occupy the voids of other ions. This results in different types of crystalline structures. Predict the coordination number of Cs^(+) ion and structure of CsCl , if radii of Cs^(+) and Cl^(-) ions are 1.69 Å and 1.81 Å respectively.

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