Question

43 In NaCl crystal, chloride ions present at the face center are distributed in
A. One Unit Cell
B. 8 Unit cells
C. 4 Unit cells
D. 2 Unit cells

Answer 1

Explanation:

c 4 unit cells

this is the answer

Answer 2

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Answer:

4 unit cells

Explanation:

face-centred cubic

The crystalline structure of NaCl is face-centred cubic.

The total number of ions present in one unit cell of sodium chloride lattice is 8.

It includes 4 Na+ ions and 4 Cl− ions.

There are 8 Cl− ions at 8 corners of fcc unit cell (each one contributes one eigth to unit cell) and 6 Cl− ions at 6 face centres  (each one contributes one half to unit cell)

Total number of Cl− ions in the unit cell =8×81+6×21=1+3=4

Na+ ions occupies octahedral voids.

There are 4 octahedral voids in fcc unit cell.

Thus, there are 4 Na+ ions in fcc unit cell.