Question

Cement is formed hard By
A).Dehydration
B). Hydration and dissociation of water
C). dissociation of water
D). polymerization

Answer 1

Hint: A Cement may be a binder, a substance used for construction that sets, hardens, and adheres to other materials to bind them together. Cement is seldom used on its own, but rather to bind sand and gravel together.

Complete answer:
Cement is hardened due to hydration, chemical reactions that occur independently of the mixture’s water content; they will harden even underwater or when constantly exposed to wet weather. The reaction that results when the anhydrous cement powder is mixed with water produces hydrates that aren't water-soluble.
 The formation of an answer involves the interaction of solute with solvent molecules. Many various liquids are often used as solvents for liquid solutions, and water is the most ordinarily used solvent. When water is employed because of the solvent, the dissolving process is named hydration. The interaction between water molecules and sodium ions is illustrated together in the diagram below. This is often a typical ion-dipole interaction. At the molecular level, the ions interact with water molecules from all directions during a 3-dimensional space. This diagram depicts the concept of interaction only.
Hence, the choice B is the correct answer of the question.

Note:
Cement is especially used as a binder in concrete, which may be a basic material for all kinds of construction, including housing, roads, schools, hospitals, dams and ports, also as for decorative applications (for patios, floors, staircases, driveways, pool decks) and items like tables, sculptures or bookcases.