Which of the following is/are true?....

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Which of the following is/are true?
(1) In \( \mathrm{NaCl} \) crystals, \( \mathrm{Na}^{+} \)ions are in all octahedral
\( \mathrm{P} \)
voids.
(2) In zinc blende, \( \mathrm{Zn}^{2+} \) ions are present in alternate tetrahedral voids
(3) In \( \mathrm{CaF}_{2}, F^{-} \)ions occupy all tetrahedral voids
(4) In \( \mathrm{Na}_{2} \mathrm{O}, \mathrm{O}^{2-} \) ions occupy half the octahedral voids


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