For which of the following purposes is Gypsum added to cement clinker?

Options :
  1. To increase the tensile strength of cement
  2. To bind the particles of calcium silicate
  3. To decrease the rate of setting of cement
  4. To facilitate the formation of colloidal gel
Answer and Explanation :-

Answer: Option 3

Explanation:

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Albus Severus," Harry said quietly, so that nobody but Ginny could hear, and she was tactful enough to pretend to be waving to Rose, who was now on the train, "you were named for two headmasters of Hogwarts. One of them was a Slytherin and he was probably the bravest man I ever knew.
-J.K. Rowling Harry Potter and the Deathly Hallows