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Question

The positions of Cl ions in NaCl structure are :

A
corners of the cube.
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B
centres of faces of the cube.
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C
corners as well as centres of the faces of the cube.
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D
edge centres of the cube.
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Solution

The correct option is A corners as well as centres of the faces of the cube.
NaCl forms FCC structure lattice, with cation at all the octahedral voids while anion occupies corners and centres of the faces of the cube, as shown in the figure. Red colour dots are cation and green balls are Chlorine ions.

Hence, the correct option is C.

Image result for nacl cubic structure

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