Question

In which one of the following industries is limestone used as a raw material?

• A. Plastic
• B. Automobile
• C. Cement
• D. Aluminium

Hint:

Limestone plays a vital role in the construction industry, not only for cement production but also in the manufacturing of glass, steel, and as a filler in various other products.

Answer 1

The Correct Option is C

Limestone is primarily used as a raw material in the cement industry . It is the main source of calcium carbonate (CaCO\_3), which is a key component in the production of cement. In the manufacturing of cement, limestone is heated in a rotary kiln to produce lime (calcium oxide), which is then combined with other ingredients like clay to form cement.
Limestone is also used in other industries, such as:
- Plastic industry : Limestone may be used as a filler material, but it is not a major raw material.
- Automobile industry : Limestone is not a direct raw material in the automobile manufacturing process.
- Aluminium industry : The production of aluminium mainly involves bauxite , not limestone.
Thus, cement is the correct answer because limestone is a fundamental material in cement production.