The correct answer is: a) Cement industry.
Limestone is a sedimentary rock composed mainly of calcium carbonate (CaCO3). It is the most common sedimentary rock in the world, and it is used in a variety of industries, including the cement industry, the construction sector, steel production, and the chemical industry.
In the cement industry, limestone is used to make cement, which is a binding agent that is used in concrete and other building materials. Limestone is also used in the construction sector as a building material, and it is used in the production of steel as a flux. In the chemical industry, limestone is used to make a variety of products, including lime, soda ash, and calcium chloride.
Limestone is a valuable resource that is used in a variety of industries. It is a non-renewable resource, and it is important to use it wisely.
Here is a brief explanation of each option:
- Option a: Cement industry. Limestone is the main ingredient in cement, which is a binding agent that is used in concrete and other building materials.
- Option b: Construction sector. Limestone is used in the construction sector as a building material. It is used in the construction of roads, bridges, buildings, and other structures.
- Option c: Steel production. Limestone is used in the production of steel as a flux. A flux is a substance that is added to a molten metal to remove impurities.
- Option d: Chemical industry. Limestone is used in the chemical industry to make a variety of products, including lime, soda ash, and calcium chloride.