Major Minerals — Set 3

Correct Answer: D. Odisha

• **Odisha** = produces more than 90% of India's chromite, primarily from the Sukinda valley. • **Sukinda valley** — Odisha's Sukinda is one of the world's largest chromite deposits; chromite is used in stainless steel production and chrome plating. • 💡 Wrong-option analysis: Jharkhand: known for iron ore, coal, and uranium, not chromite; Maharashtra: has manganese and other minerals but not a chromite producer; Karnataka: has some mineral wealth but not a chromite producer.

Correct Answer: C. Arabian Sea

• **Arabian Sea** = the location of the Bombay High offshore oil field, operated by ONGC off the coast of Mumbai. • **ONGC operated** — Bombay High (Mumbai High) is India's largest oil field, operated by ONGC since its discovery in 1974, in the Arabian Sea. • 💡 Wrong-option analysis: Bay of Bengal: eastern coast sea, Bombay High is on the western coast; Indian Ocean: too broad a term; Bombay High is specifically in the Arabian Sea; Andaman Sea: located near Andaman Islands, far from Mumbai.

Correct Answer: B. Lignite

• **Lignite** = the type of coal (brown coal) mined at Neyveli in Tamil Nadu, primarily used for thermal power generation. • **Neyveli Lignite Corporation** — NLC India operates India's largest lignite mines at Neyveli; lignite has high moisture and lower heating value than bituminous coal. • 💡 Wrong-option analysis: Anthracite: highest quality coal, found in limited quantities in J&K, not Tamil Nadu; Peat: partially carbonized organic matter, not mined at Neyveli; Bituminous: medium-grade coal found in Gondwana coalfields of Jharkhand, West Bengal.

Correct Answer: D. Galena

• **Galena** = the primary ore from which both lead and zinc are extracted, mostly mined in Rajasthan. • **Rajasthan's Zawar and Rampura-Agucha** — the Zawar mines in Udaipur and Rampura-Agucha in Bhilwara are India's major galena deposits for lead-zinc production. • 💡 Wrong-option analysis: Pyrite: iron sulfide, source of sulfur not lead-zinc; Hematite: iron ore, used for steel not lead-zinc; Bauxite: aluminum ore, not related to lead or zinc production.

Correct Answer: B. Odisha

• **Odisha** = the top producer of bauxite in India, with major deposits in the Panchpatmali hills in Koraput district. • **NALCO operations** — the National Aluminium Company (NALCO) operates major bauxite mines in Odisha's Panchpatmali hills, supporting aluminum smelters. • 💡 Wrong-option analysis: Maharashtra: has some bauxite in Kolhapur and Ratnagiri but far less than Odisha; Gujarat: has mineral wealth but not a leading bauxite producer; Jharkhand: has iron ore and coal as primary minerals, not bauxite.

Correct Answer: A. Magnetite

• **Magnetite** = the finest iron ore with up to 70% iron content, known for its excellent magnetic properties. • **70% iron content** — magnetite has the highest iron percentage among all iron ore varieties; it is especially valuable in the electrical and steel industries. • 💡 Wrong-option analysis: Siderite: iron carbonate ore with lower iron content (about 48%); Hematite: most industrially important iron ore with 50-60% iron, not as high as magnetite; Limonite: hydrated iron oxide with lower iron content and less economic importance.

Correct Answer: D. West Bengal

• **West Bengal** = the state where the Raniganj coalfield, India's oldest, is located, part of the Gondwana coal deposits. • **First coal mining in India** — Raniganj was the site of India's first organized coal mining, begun in 1774; it produces high-quality non-coking coal. • 💡 Wrong-option analysis: Odisha: has Talcher coalfield, important but not the oldest; Chhattisgarh: has Korba coalfield, important but newer; Jharkhand: has Jharia and Bokaro, significant but Raniganj is in West Bengal.

Correct Answer: B. Pyrite

• **Pyrite** = known as 'Fool's Gold' because its metallic luster and brass-yellow color closely resemble real gold. • **Iron sulfide** — chemically, pyrite is FeS2 (iron sulfide), much harder and chemically very different from gold, hence the 'fool' who confuses them. • 💡 Wrong-option analysis: Bauxite: aluminum ore, reddish-brown, doesn't look like gold; Copper: reddish metal, not yellow/gold colored like pyrite; Magnetite: black iron ore, magnetic, does not resemble gold.

Correct Answer: A. Rajasthan

• **Rajasthan** = the leading producer of limestone in India, vital for its numerous cement plants. • **Cement flux use** — limestone is both the primary raw material for cement and used as flux in blast furnaces; Rajasthan's limestone-rich geology supports many cement industries. • 💡 Wrong-option analysis: Madhya Pradesh: has some limestone deposits but Rajasthan leads; Karnataka: has limestone deposits but not the top producer; Andhra Pradesh: has limestone deposits but Rajasthan is the leader.

Correct Answer: B. Gujarat

• **Gujarat** = the state where the Ankleshwar oil field is located, a major onshore petroleum-producing region. • **1960s discovery** — Ankleshwar was discovered in the 1960s; its oil is processed at the Koyali (Vadodara) refinery, one of India's largest. • 💡 Wrong-option analysis: Assam: has Digboi oil fields but Ankleshwar is in Gujarat; Tamil Nadu: has some mineral wealth but Ankleshwar is not there; Maharashtra: has offshore Bombay High but Ankleshwar is an onshore Gujarat field.