JEE Main20238 Apr 2023Morning ShiftChemistrys Block ElementsActual
What is the purpose of adding gypsum to cement?
Options
- ATo facilitate the hydration of cement
- BTo slow down the process of setting
- CTo give a hard mass
- DTo speed up the process of setting
Correct answer
B. To slow down the process of setting
Step-by-step solution
When mixed with water the setting of cement takes place to give a hard mass. The is due to the hydration of molecules of the constituents and their rearrangement. Gypsum is CaSO 4 . 2 H 2 O . The purpose of adding gypsum is only to slow down the process of setting of the cement so that it gets sufficiently hardened.