Which of the following are true ?

1.	Which of the following are true ?
Answer» In NaCl crystals , `Na^+` ions are present in all the OCTAHEDRAL voids In ZnS (zinc blende) , `ZN^(2+)` ions are present in alternate tetrahedral voids . In `CaF_2, F^- ` ions occupy all the tetrahedral voids In `Na_2O, O^(2-)` ions occupy half the octahedral voids. SOLUTION :Only (d) is not true because in `Na_2O, O^(2-)` ions are present in close packing and `Na^+` ions occupy all the tetrahedral voids.

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