Question

Assertion :In NaCl structure, $N{a}^{+}$ ions occupy octahedral holes and $C{l}^{-}$ ions occupy ccp. Reason: The distance of the nearest neighbors in NaCl structure is $\frac{a}{2}$ where $a$ is the edge length of the cube.

Read the above assertion and reason and choose the correct option regarding it.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

In NaCl, $C{l}^{-}$ ions occupy the ccp sites whereas $N{a}^{+}$ ions occupy the octahedral voids.
The distance between an atom at the corner $\left(C{l}^{-}\right)$ and an atom at the corresponding edge-centre$\left(N{a}^{+}\right)$ is equal to $\frac{a}{2}$ which is the distance between nearest neighbours.