Metals & Ores — Set 4
Chemistry · धातुएं और अयस्क · Questions 31–40 of 50
Hematite is a widely used ore for which metal?
Correct Answer: A. Iron
Hematite is the most important iron ore because of its high iron content. It is an iron oxide mineral that appears reddish or black. Almost all the iron used in modern construction comes from hematite.
Which ore is used to extract the metal Mercury?
Correct Answer: D. Cinnabar
Cinnabar is the only major ore for mercury extraction. It is a sulfide mineral that is typically found near volcanic activity. Mercury is the only metal that is liquid at room temperature.
Copper Pyrites (Chalcopyrite) is a significant ore of?
Correct Answer: B. Copper
Chalcopyrite is the most widely occurring copper mineral. It is a copper iron sulfide that resembles gold in its appearance. It accounts for about 25% of the world's copper production.
Bauxite must be refined to produce which intermediate substance?
Correct Answer: B. Alumina
Bauxite is refined through the Bayer process to produce alumina (aluminium oxide). Alumina is then smelted into pure aluminium metal using electricity. This two-step process is the global standard for aluminium.
Magnetite is characterized by which of the following properties?
Correct Answer: B. Magnetic properties
Magnetite is a naturally occurring magnetic mineral. It was used in ancient times as the first compass, known as a lodestone. It is an excellent iron ore due to its high purity.
Which metal is typically extracted from 'Galena'?
Correct Answer: A. Lead
Galena is the primary mineral used for the extraction of lead. It is easily processed due to its high lead sulfide content. Lead is essential for manufacturing acid-lead batteries.
The ore 'Cassiterite' is the world's main source of?
Correct Answer: B. Tin
Cassiterite is the oxide mineral that provides almost all the world's tin. It is heavy and resistant to weathering, often collecting in riverbeds. Tin is vital for creating alloys like bronze.
Which of the following is the chief ore of Zinc?
Correct Answer: B. Zinc Blende
Zinc Blende, also known as Sphalerite, is the chief source of zinc. It is a sulfide mineral that is often found with lead ores. Zinc is used to coat steel to prevent it from rusting.
Argentite is commonly referred to by which other name?
Correct Answer: A. Silver glance
Argentite is popularly called silver glance due to its dark, shiny appearance. It is a sulfide of silver that is easily smelted. Silver is widely used in jewelry and electronics.
Dolomite is an important industrial mineral containing?
Correct Answer: A. Magnesium
Dolomite is a rock-forming mineral that provides a source of magnesium. It is chemically distinct from limestone because of its magnesium content. It is used as a refractory material in steel furnaces.