$(a)\;1\qquad(b)\;2\qquad(c)\;3\qquad(d)\;4$

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Total no. of atoms (Z) per unit cell = $8\times\large\frac{1}{8}+1$

$\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;\;=2$

Density $\rho = \large\frac{Z\times at.wt}{Av.No.\times a^3}$

$=\large\frac{2\times23}{6.023\times10^{23}\times(4.24\times10^{-8})^3}$

$=1.0 gcm^{-3}$

Hence answer is (a)

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