Narnaul is famous for mining of …….. .

The correct answer is: A. Gypsum

Narnaul is a city in the Indian state of Haryana. It is located in the Narnaul district, which is one of the 21 districts of Haryana. The city is famous for its gypsum mines. Gypsum is a mineral that is used in a variety of industries, including construction, agriculture, and manufacturing.

The other options are incorrect because:

• Limestone is a sedimentary rock that is composed of calcium carbonate. It is used in a variety of industries, including construction, cement production, and agriculture.
• Iron ore is a mineral that is used to produce iron. It is found in a variety of forms, including hematite, magnetite, and taconite.
• Slate is a metamorphic rock that is formed from shale. It is used in a variety of applications, including roofing, flooring, and countertops.