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In a sodium chloride crystal, the unit cell edge length is \( a \). The option(s) representing the correct combination is/are
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\begin{tabular}{ccccc}
\hline Options & Nearest neighbour of \( \mathbf{N a}^{+} \)ion & Ion & Distance from \( \mathbf{N a}^{+} \)ion & Number of ions \\
\hline (a) & \( 2^{\text {nd }} \) & \( \mathrm{Na}^{+} \) & \( 0.707 a \) & 12 \\
(b) & \( 3^{\text {rd }} \) & \( \mathrm{Cl}^{-} \) & \( 0.866 a \) & 8 \\
(c) & \( 4^{\text {th }} \) & \( \mathrm{Na}^{+} \) & \( a \) & 6 \\
(d) & \( 5^{\text {th }} \) & \( \mathrm{Cl}^{-} \) & \( 1.12 a \) & 24 \\
\hline
\end{tabular}
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