Question

Assertion (A) : In CsCl crystal, $C{s}^{+}$ ions adopt bcc arrangement.
Reason (R) : For N atoms adopting bcc arrangement, there are 2N tetrahedral voids.

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
• C. (A) is correct but (R) is incorrect
• D. (A) is incorrect but (R) is correct
• E. Both (A) and (R) are incorrect

Answer 1

Answer: (C)

(A) is correct but (R) is incorrect

In $CsCl$, $C{s}^{+}$ ions are present at body centers and $C{l}^{-}$ ions are present at corners.
In BCC arrangement there are no tetrahedral voids but octahedral voids are present.