Metals & Ores — Set 2
Chemistry · धातुएं और अयस्क · Questions 11–20 of 50
Which ore is used to extract the metal Chromium?
Correct Answer: C. Chromite
Chromite is an oxide mineral that is the only commercial ore of chromium. It is commonly found in the Earth's mantle and crustal rocks. Chromium gives stainless steel its characteristic resistance to rust.
Sphalerite is a major ore of which metal?
Correct Answer: A. Zinc
Sphalerite is the most common zinc mineral and a major ore. It often occurs in association with galena and pyrite. Zinc is often alloyed with copper to create brass.
Malachite is a green mineral that serves as an ore of?
Correct Answer: A. Copper
Malachite is a copper carbonate hydroxide mineral. Its vibrant green color makes it popular as a gemstone and pigment. Ancient civilizations often used it as their primary copper source.
Which of the following is an ore of Iron?
Correct Answer: C. Magnetite
Magnetite is a rock mineral and one of the main iron ores. It is naturally ferrimagnetic and the most magnetic of all minerals. It has a high iron content of about 72%.
The ore 'Monazite' is a significant source of which element?
Correct Answer: D. Thorium
Monazite is a reddish-brown phosphate mineral containing rare-earth metals. It is the primary source of thorium, especially in beach sands. Thorium is being researched for use in safer nuclear reactors.
Bornite is a sulfide mineral ore of which metal?
Correct Answer: B. Copper
Bornite is a copper iron sulfide mineral commonly known as peacock ore. It turns iridescent shades of blue and purple when tarnished. It is found globally in hydrothermal copper veins.
Stibnite is the primary ore for which semi-metal?
Correct Answer: D. Antimony
Stibnite is a sulfide mineral that is the leading source of antimony. It forms long, needle-like crystals that are lead-gray in color. Antimony is used in flame retardants and lead alloys.
Which metal is commonly extracted from the ore 'Pentlandite'?
Correct Answer: A. Nickel
Pentlandite is the principal ore for the extraction of nickel. It is an iron-nickel sulfide typically found in basic igneous rocks. Nickel is a vital component in making rechargeable batteries.
Rutile is a mineral composed primarily of which oxide?
Correct Answer: A. Titanium dioxide
Rutile is the most common natural form of titanium dioxide. It is used to extract titanium metal for high-strength aerospace parts. Titanium is prized for being as strong as steel but much lighter.
Cryolite was historically used in the extraction of which metal?
Correct Answer: C. Aluminium
Cryolite acts as a flux to lower the melting point of alumina during electrolysis. It was originally discovered in Greenland as a rare mineral. This process is essential for making aluminium production energy-efficient.