Sol - gel transformation is seen in________________?
Correct answer: B. Hydrocolloids
- A. Impression plaster
- B. Hydrocolloids
- C. Elastomer
- D. Impression compound
Explanation
Hydrocolloids undergo a reversible sol-to-gel transformation: heating converts the gel to sol and cooling converts it back to gel. Elastomers set by polymerization rather than by this physical transformation.
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