A crystal of lead (II) sulphide has \( \mathrm{NaCl} \) structure. In this crystal the shortest ...

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A crystal of lead (II) sulphide has \( \mathrm{NaCl} \) structure. In this crystal the shortest distance between a \( \mathrm{Pb}^{+2} \) ion and \( \mathrm{S}^{-2} \) ion is \( 297 \mathrm{pm} \). What is the volume of unit cell in lead sulphide?
(A) \( 209.6 \times 10^{-24} \mathrm{~cm}^{3} \)
(B) \( 207.8 \times 10^{-23} \mathrm{~cm}^{3} \)
(C) \( 22.3 \times 10^{-23} \mathrm{~cm}^{3} \)
(D) \( 209.8 \times 10^{-23} \mathrm{~cm}^{3} \)
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