Addition of 2% gypsum in cement:
Correct answer: C. Prevents rapid hardening
- A. Triggers hydration
- B. Triggers hydrolysis
- C. Prevents rapid hardening
- D. All of the above options are correct
Explanation
Portland cement is made by strongly heating a finely powdered mixture of clay and limestone. The final product, known as clinker, is cooled and then ground into a very fine powder. During the grinding, there is added about 2% of gypsum which prevents the cement from hardening too rapidly. The addition of gypsum increases the setting time of cement.Hence, C is the correct option.
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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