Chemistrymedium · Past Paper
Which of the following substances is used to slow down the setting of cement (acting as a negative catalyst/inhibitor)?
ALimestone
BClay
CGypsum
DSilica
✓ Correct Answer: C — Gypsum
Gypsum ($CaSO_4.2H_2O$) is added to cement to control the rate of hardening (setting time).
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