Question

The positions of ${Cl}^{-}$ ions in NaCl structure are :

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

Answer 1

Answer: (C)

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.