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Q.

In the unit cell of NaCl, which of the following statements are correct?

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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 neighour of Na+ ion are twelve Na+ ions

d

NaCl has 68% of occupied space

answer is A, B, C.

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Detailed Solution

Co-ordination no of NaCl = 6 : 6 Na+ surrounded by 6Cl, Cl surrounded by 6Na+. Second nearest neighbours of Na+ ion are 12Na+ i.e., The ion at the body centre is
surrounded by 4Na+ at edge centre (Xdirection) 4Na+ (X-direction), 4Na+ (Zdirection).

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