Q13 / 90 · JEE Main 2023 (08 Apr Shift 1) · Chemistry

What is the purpose of adding gypsum to cement?

  • A
    To facilitate the hydration of cement
  • Correct answer
    B
    To slow down the process of setting
  • C
    To give a hard mass
  • D
    To speed up the process of setting

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 CaSO4.2H2O. The purpose of adding gypsum is only to slow down the process of setting of the cement so that it gets sufficiently hardened.

Hence, the correct answer is option: 'B'.

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