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Question

Which of the following is TRUE for NaCl type structure?


A

Cations are present at tetrahedral voids

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B

It has 8:4 coordination.

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C

Cations are present at octahedral voids

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D

It has 6:6 coordination

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Solution

The correct option is D

It has 6:6 coordination


Just recall the structure of NaCl here.

NaCl It has a face-centered cubic (fcc) arrangement (also called cubic close packing, i.e., ccp) in which Cl ions occupy the corners and face centers of the cube while Na ions are present at the body center and edge centers.

NaCl structure

Each Na ion is surrounded by six Cl ions and each Cl ion is surrounded by six Na ions. In other words, the Na ions as well as Cl ions have coordination number of 6, i.e., this structure has 6 : 6 coordination, i.e., Cl ions being larger in size are present in the cubic close packing while Na ions are present in all the octahedral voids.


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