Question

If the positions of $N{a}^{+}$ and $C{l}^{-}$ are interchanged in $NaCl,$ , the crystal lattice with respect to $N{a}^{+}$ and $C{l}^{-}$ is

• A. bcc and fcc
• B. fcc and bcc
• C. Both fee
• D. Both bcc

Answer 1

Answer: (C)

Each $N{a}^{+}$ in $NaCl$ is surrounded by six $C{l}^{-}$ and each $C{l}^{-}$ in $NaCl$ is surrounded by six $N{a}^{+}$ and, thus on interchanging $C{l}^{-}$ the fee structure of $NaCl$ will not change.