Metals & Ores — Set 3
Chemistry · धातुएं और अयस्क · Questions 21–30 of 50
Which mineral is a source of Magnesium and is also known as 'Bitter Salt'?
Correct Answer: C. Epsomite
Epsomite is the mineral name for magnesium sulfate, commonly called Epsom salt. It is highly soluble in water and has a distinct bitter taste. It is used in medicine and agriculture to treat magnesium deficiency.
Wolframite is the most important ore of which metal?
Correct Answer: D. Tungsten
Wolframite is an iron manganese tungstate mineral. It is the chief source of tungsten, which has the highest melting point of all metals. Tungsten is widely used in light bulb filaments and drill bits.
Beryl is the primary ore for which lightweight metal?
Correct Answer: D. Beryllium
Beryl is a mineral composed of beryllium aluminium cyclosilicate. Emerald and aquamarine are famous gemstone varieties of beryl. Beryllium is used in mirrors for space telescopes due to its rigidity.
Which of the following is a carbonate ore of Calcium?
Correct Answer: A. Limestone
Limestone is a sedimentary rock composed mainly of calcium carbonate. It is used to produce cement and as a flux in steelmaking. It is also the main source of lime for agricultural use.
Anglesite is an ore formed from the oxidation of which mineral?
Correct Answer: A. Galena
Anglesite is a lead sulfate mineral that forms when galena is oxidized. It is found in the upper parts of lead-bearing mineral veins. It serves as a secondary source of lead metal.
Scheelite is an ore used for the extraction of which element?
Correct Answer: B. Tungsten
Scheelite is a calcium tungstate mineral and an important ore of tungsten. It glows blue under ultraviolet light, which helps prospectors find it. Tungsten is essential for making high-speed steel tools.
Which of the following is a common ore of Copper?
Correct Answer: C. Chalcocite
Chalcocite is an important copper sulfide mineral. It has been mined as a copper ore for centuries due to its high copper content. It is often found in enriched zones below the water table.
The ore 'Dolomite' contains both Magnesium and which other metal?
Correct Answer: D. Calcium
Dolomite is a carbonate mineral of calcium and magnesium. It is very similar to limestone but contains significant magnesium. It is used in the glass and ceramic industries.
Pyrite is often called 'Fool's Gold' but is actually an ore of?
Correct Answer: D. Iron
Pyrite is an iron sulfide with a metallic luster and brass-yellow hue. While it looks like gold, it is much harder and more brittle. It is primarily used to produce sulfur and sulfuric acid.
Which of these minerals is an ore of Potassium?
Correct Answer: C. Sylvite
Sylvite is potassium chloride in its natural mineral form. It is the most important source of potash for the fertilizer industry. Potassium is a vital nutrient for plant growth and health.