In the unit cell of NaCl, which of the following statements are correct ?A. `Na^(+)` ions have six `Cl^(-)` ions in its nearest neighbourhood.B. `Cl^(-)` ions have six `Na^(+)` ions in its nearest neighbourhood.C. Second nearest neighbour of `Na^(+)` ion are twelve `Na^(+)` ions.D. NaCl has 68% of occupied space.

In the unit cell of NaCl, which of the following statements are correc

1.	In the unit cell of NaCl, which of the following statements are correct ?A. `Na^(+)` ions have six `Cl^(-)` ions in its nearest neighbourhood.B. `Cl^(-)` ions have six `Na^(+)` ions in its nearest neighbourhood.C. Second nearest neighbour of `Na^(+)` ion are twelve `Na^(+)` ions.D. NaCl has 68% of occupied space.
Answer» Correct Answer - A::B::C

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Packing refers to the arrangement of constituent units in such a way that the forces of attraction among the constituent particles is maximum and the constituents occupy the maximum available space. In two -dimensions ,there are square close packing and hexagonal close packing .In three- dimensions ,however, there are hexagonal close packing, cubic close packing and body-centered cubic packing. (i) hcp: AB AB AB AB ..... arrangement `" "`coordination no. = 12 `" "` % occupied space = 74 (ii) ccp: ABC ABC.... arrangement lt brgt `" "` coordination no. = 12 `" "`% occupied space = 74 bcc: 68% space is occupied `" "`coordination no.= 8 The empty space laft in three -dimensions is :A. `26%`B. `74%`C. `52.4%`D. `80%`

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