The NaCl lattice has the cubic unit cell as shown.The correct statements are.

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rcation+ranion= a/2

Cl-- at faces and edges

Na+ at corners and body center

radius of cation to anion is 2-1

answer is A.

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Detailed Solution

Since, side r++r−and diagonal = 2r−=2r++r−∴ 2r−=2r++r− 2=r++r−r−=r+r−+1∴ r+r−=2−1=0.414

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