Which of the following statement(s) for crystal having Schottky defect is/are correct?

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The crystal having Schottky defect eclectically neutral as a whole

Schottky defect arises due to absence of cations and anions from position which they are expected to occupy

The density of crystal having Schottky is smaller than that of perfect crystal

Schottky defect are more common in co-valent compound with higher co-ordination number

answer is A, B, D.

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Detailed Solution

From part of the lattice points being vacant or having holes in them (a). The same number of positive and negative ions are absent, keeping the crystal neutral overall.
In ionic compounds with high coordination numbers and where the sizes of the positive and negative ions are almost equal, Schottky defects are more prevalent. $NaCI, KCI, CsCI,$ and $KBr$ , as examples.
As the temperature rises, the number of faults grows. At 775 K and 1075 K, respectively, there are faults at one in 106 and one in 104 locations, respectively. Schottky flaws cause a crystal's density to significantly decrease when they are present.

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