Chhattisgarh is a major exporter of:

Iron ore
Coal
Limestone
All of the above

Chhattisgarh is a major exporter of iron ore, coal, and limestone.

Iron ore is a mineral that is used to make steel. It is the main raw material used in the production of steel, and is also used in the production of other metals, such as iron and steel alloys. Iron ore is found in rocks and minerals, and is extracted from the earth through mining.

Coal is a fossil fuel that is used to generate electricity, produce steel, and make other products. It is formed from the remains of ancient plants and animals that have been buried and subjected to heat and pressure over millions of years. Coal is found in deposits around the world, and is one of the most important energy sources in the world.

Limestone is a sedimentary rock that is composed of calcium carbonate. It is used in a variety of industries, including construction, agriculture, and manufacturing. Limestone is also used to make cement, which is used in the construction of buildings and roads.

Chhattisgarh is a state in central India. It is the largest state in India by area, and the 10th most populous state. Chhattisgarh is a major producer of iron ore, coal, and limestone. The state has a number of large mines, and is a major exporter of these minerals.