Answer :

Final answer:

Cement is primarily made from a combination of limestone and clay. This mixture is heated to produce clinker, which is then ground to create cement. Other combinations listed do not accurately represent the composition of cement.


Explanation:

Understanding Cement Composition

Cement is a key ingredient in construction and is primarily made through the combination of various raw materials. The correct option from the choices provided is:

  1. a. limestone + clay

Cement production involves heating limestone (calcium carbonate) along with clay (which contains silica, alumina, and iron oxide) in a kiln at high temperatures to produce clinker. This clinker is then mixed with gypsum and ground to create cement. The other options, including limestone with coal or limestone with water, do not accurately describe the composition of cement.

In summary, the basic ingredients for cement are limestone and clay, which react under heat to form the essential compound needed for construction.


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