Which of the following is TRUE for NaCl type structure?
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.