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A solid crystallines in a hexagonal stru...

A solid crystallines in a hexagonal structures as shown in the figure. If density of solid is `2sqrt(3) gm//cm^(3)`. How many molecules are present in the given unit cell?

[Take Avogadro's number `=6 xx 10^(23)`, Atomic mass of solid = 450]

A

6

B

18

C

2

D

4

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