Correct Answer: Option A — Limestone. Limestone is correctly identified as a sedimentary rock composed mainly of calcium carbonate minerals. Limestone is also associated with large deposits occur across several states including Rajasthan, Madhya Pradesh, Andhra Pradesh and Chhattisgarh. Another identifying fact about Limestone is that it is the principal raw material for cement manufacture. A further exam-relevant fact about Limestone is that it is also used as a flux in iron and steel processing. Why the other options are incorrect: • Option B — Uranium: Uranium is a radioactive mineral resource used as nuclear fuel. It is incorrect here because Uranium is instead associated with Jaduguda and nearby Singhbhum deposits in Jharkhand are important associations. • Option C — Coal: Coal is a combustible sedimentary energy resource. It is incorrect here because Coal is instead associated with major Gondwana coalfields occur in the Damodar, Son, Mahanadi and Godavari valleys. • Option D — Petroleum: Petroleum is a liquid fossil fuel accumulated in sedimentary basins. It is incorrect here because Petroleum is instead associated with important Indian producing regions include Assam, Gujarat, Mumbai Offshore and the Krishna-Godavari basin. Exam Takeaway: Connect Limestone with “a sedimentary rock composed mainly of calcium carbonate minerals” and “large deposits occur across several states including Rajasthan, Madhya Pradesh, Andhra Pradesh and Chhattisgarh” for revision.
