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Question

Which of the the following structure is not correctly matched?

A
NaCl type- Cl ions in ccp structure.
Na+ ions in half octahedral holes.
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B
ZnS type- S2 ions in ccp structure.
Zn2+ ions in alternate tetrahedral voids.
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C
CaF2 type-ccpstructure.
F ions in all tetrahedral voids.
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D
Na2O type- ccp structure.
Na+ ions in all tetrahedral holes.
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Solution

The correct option is A NaCl type- Cl ions in ccp structure.
Na+ ions in half octahedral holes.
In NaCl, chloride ions are ccp type of arrangement, i.e., it contains chloride ions at the corners and at the centre of each face of the cube.
Sodium ions are so located that there are six chloride ions around it. This equivalent to saying that sodium ions occupy all the octahedral sites.

So, option A is not correctly matched.

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