Q.

How many formula units are there in the unit cell of sodium chloride?

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a

2

b

6

c

4

d

8

answer is C.

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Detailed Solution

In NaCl (rock salt): Number of Na+ ions = 12 (at edge centers) ×14   + 1 (at body centre) ×1=4Number of Cl- ions = 8 (at corners) ×18 + 6 (at face centre) ×12=4Thus 4 formula units per unit cell.
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