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NEET levelSingle correct optionDifficulty 1 of 3ss132

The number of formula units of $ZnS$ (zinc blende) per unit cell is

A4
B1
C2
D8

Answer: A

S X^{2 -}

ions are at the corners and face centres of the cube (

8 \times \frac{1}{8} + 6 \times \frac{1}{2} = 4

) and 4

Zn X^{2 +}

ions lie inside, so

Z = 4

.

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