Metals & Ores — Set 5
Chemistry · धातुएं और अयस्क · Questions 41–50 of 50
Which of the following is a sulfide ore of Copper?
Correct Answer: C. Chalcopyrite
Chalcopyrite is a major sulfide ore that contains both copper and iron. It is the most common mineral used for copper extraction worldwide. Most copper in electrical wiring begins as chalcopyrite.
Pyrolusite is an ore primarily used for the extraction of?
Correct Answer: D. Manganese
Pyrolusite is the primary oxide mineral of manganese. It is often found as black dendrites on the surface of rocks. Manganese is a key alloying element for tough, wear-resistant steel.
The ore 'Carnallite' is chemically classified as a?
Correct Answer: A. Chloride
Carnallite is a double chloride mineral of potassium and magnesium. It forms in evaporite deposits where ancient seas have dried up. It is a crucial mineral for the fertilizer industry.
Siderite is an iron ore that belongs to which chemical group?
Correct Answer: A. Carbonates
The correct answer is 'Carbonates'. Siderite is a carbonate of iron and is a minor iron ore. It is less common than hematite but still useful in certain regions. It has a characteristic brownish-yellow color.
Which of the following ores is a significant source of Uranium?
Correct Answer: C. Pitchblende
Pitchblende, or Uraninite, is the principal mineral for uranium extraction. It contains uranium oxides and is the source of radium. Uranium is the primary fuel for nuclear power plants.
The mineral 'Malachite' is easily recognized by its color, which is?
Correct Answer: B. Green
Malachite is famous for its distinctive, banded green color. It is a basic copper carbonate mineral formed by weathering copper ores. It is used as an ore of copper and in decorative arts.
Calamine lotion is derived from an ore of which metal?
Correct Answer: D. Zinc
Calamine refers to zinc carbonate or zinc silicate minerals. The medicinal lotion is made using zinc oxide from these sources. Zinc has antimicrobial properties that soothe skin irritation.
Which of these ores is an oxide of Iron with the highest iron content?
Correct Answer: A. Magnetite
Magnetite contains the highest percentage of iron among common iron ores at 72.4%. It is black in color and strongly attracted to magnets. It is a key mineral for the global steel industry.
Limestone is the primary source of which alkaline earth metal?
Correct Answer: B. Calcium
Limestone is mostly made of calcium carbonate from ancient marine life. It is the primary industrial source of calcium compounds. Calcium is essential for building materials like mortar and concrete.
Monazite sands are famous for containing which energy-related element?
Correct Answer: A. Thorium
Monazite is a phosphate mineral found in heavy sand deposits. It is the main commercial source of the radioactive element thorium. Thorium is often considered a potential future nuclear fuel.