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Question

Examine the given defective crystal
A+B−A+B−A+
B−0 B−A+B−
A+B−A+0 A+
B−A+B−A+B−
How is the density of the crystal affected by this defect?
[1 mark]

A
Density increases
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B
Density decreases
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C
No effect on density
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D
Density first increases then decreases
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Solution

The correct option is B Density decreases
The given defective crystal shows that there is missing of one cation and one anion from their lattice positions which is Schottky defect. Due to missing of ions, density of the crystal decreases.

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