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Comprehension XI
The crystal \( \mathrm{AB} \) (rock salt structure) has molecular mass \( 6.023 y \mathrm{amu} \), where \( y \) is an arbitrary number in amu. If the
\( \mathrm{P} \) minimum distance between cation and anion is \( y^{1 / 3} \mathrm{~nm} \) and the observed density is \( 20 \mathrm{~kg} / \mathrm{m}^{3} \).
Which of the following is the type of defect in solids?
(a) Frenkel defect
(b) Schottky defect
(c) Metal excess defect
(d) Impurity defect
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