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← ScienceWhich outcome occurs when high humidity weakens plaster?
A)Ionic repulsion lowers material strength✓
B)Covalent bonds undergo hydrolysis slowly
C)Van der Waals forces increase cohesion
D)Delocalized electrons increase conductivity
💡 Explanation
The outcome is ionic repulsion due to water weakening ionic bonds in calcium sulfate because water molecules reduce the electrostatic attraction via dielectric screening. This decrease in attraction reduces cohesion, therefore the material loses strength, rather than undergoing covalent hydrolysis.
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