The correct answer is C. Lime is available by calcining calcium carbonate at 900°C.
Calcium carbonate is a common mineral found in limestone, chalk, and marble. It is also the main component of seashells and coral. When calcium carbonate is heated to 900°C, it decomposes into calcium oxide and carbon dioxide. Calcium oxide is also known as lime.
Lime is a white, powdery substance that is used in a variety of industries, including construction, agriculture, and manufacturing. It is also used to make cement, mortar, and plaster. Lime is a basic substance, which means that it reacts with acids to form salts. This property makes lime useful in a variety of applications, such as water treatment and soil remediation.
A. Lime is available in Free State is incorrect. Lime is a mineral that is found in many parts of the world, including the Free State. However, it is not exclusive to this region.
B. Lime is available by dissolving calcium carbonate in water is incorrect. Calcium carbonate is a solid, while lime is a powder. Therefore, it is not possible to obtain lime by dissolving calcium carbonate in water.
D. Lime is nothing but calcium chloride is incorrect. Calcium chloride is a salt, while lime is a mineral. Calcium chloride is also a white, powdery substance, but it has different properties than lime.