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Caustic soda left exposed to humid air absorbs so much moisture that it dissolves into a solution. This property is called:
Ahygroscopy
Bhydration
Cefflorescence
Ddeliquescence
Answer & Solution
Correct answer: D. deliquescence
1. A substance so hygroscopic that it absorbs enough water to dissolve completely is deliquescent.
2. Caustic soda (NaOH) loses its crystalline shape and dissolves in the absorbed water, forming a saturated solution.
3. Plain hygroscopy absorbs moisture but does not dissolve the substance, so that is the trap option.
4. Therefore this property is deliquescence.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 9 Solutions "Deliquescence", p.138_
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