Q .     The crystal `AB` (rock salt structure) has molecular weight `6.023` y u. Where, `y` is an arbitrary number in u. If the
minimum distance between cation and anion is `3` nm and the observed density is `20 kg //m^3`.
Find the
(i) density in `kg//m^3` and
(ii) type of defect.

JEE 2004
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