Ferrous oxide has a cubic structure and edge length of the unit cell is \( 5.0 \AA \). Assuming ...

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Ferrous oxide has a cubic structure and edge length of the unit cell is \( 5.0 \AA \). Assuming the density of ferrous oxide to be \( 3.84 \mathrm{~g} / \mathrm{cm}^{3} \), the no. of \( \mathrm{Fe}^{2+} \) and \( \mathrm{O}^{2-} \) ions present in each unit cell be : (use \( N_{A}=6 \times 10^{23} \) ):
(a) \( 4 \mathrm{Fe}^{2+} \) and \( 4 \mathrm{O}^{2-} \)
(b) \( 2 \mathrm{Fe}^{2+} \) and \( 2 \mathrm{O}^{2-} \)
(c) \( 1 \mathrm{Fe}^{2+} \) and \( 1 \mathrm{O}^{2-} \)
(d) \( 3 \mathrm{Fe}^{2+} \) and \( 4 \mathrm{O}^{2-} \)
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