Which of the following statements is correct?

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(D) $1$. In a rock salt $(NaCl)$ structure,the edge length $a = 2(r^+ + r^-)$,so $r^+ + r^- = 0.5 \, a$. This statement is correct.$2$. In a $CsCl$ st

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All are correct

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(D) $1$. In a rock salt $(NaCl)$ structure,the edge length $a = 2(r^+ + r^-)$,so $r^+ + r^- = 0.5 \, a$. This statement is correct.$2$. In a $CsCl$ structure,the cation is at the body center and anions are at the corners. The body diagonal is $\sqrt{3} \, a = 2(r^+ + r^-)$,so $r^+ + r^- = \frac{\sqrt{3}}{2} \, a$. This statement is correct.$3$. In a zinc blende $(ZnS)$ structure,$Zn^{2+}$ ions occupy half of the tetrahedral voids,and $S^{2-}$ ions form an $fcc$ lattice. Both have a coordination number of $4$. Thus,the ratio is $4:4 = 1:1$. This statement is correct.$4$. Since all statements are correct,the correct option is $D$.

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