Question

Which of the following statements is not true for rock salt (NaCl) structure?

Options

• The structure is of fcc type.

• Cl⁻ ions are present at the corners and face-centres of a cube.

• Na⁺ ions are present in alternate tetrahedral voids.

• The structure has 6 : 6 coordination.

Answer 1

Na⁺ ions are present in alternate tetrahedral voids.

Explanation:

In rock salt, Na⁺ occupies octahedral voids, not tetrahedral.