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Ionic solids must always maintain:

AConstant hardness
BUniform colour
CComplete dryness
DElectrical neutrality
Answer & Solution
Correct answer: D. Electrical neutrality
1. Removing an ion would leave a net charge behind. 2. So defects in ionic solids come in balanced pairs. 3. The requirement is electrical neutrality. _Source: syllabus Chemistry Part I, Chapter 1, The Solid State._
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