This set of Extractive Metallurgy Multiple Choice Questions & Answers (MCQs) focuses on “Natural Occurrence of Metals”.
1. A naturally occurring compound, which is mostly inorganic, solid and has a definite chemical composition and ordered internal structure is known as a/an ______
a) rock
b) vitamin
c) mineral
d) ore
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Explanation: Minerals are solid, homogeneous compounds which occur in natural form. Many products are made using minerals which we use in everyday life like salt, antacid, wooden pencil etc. Earth’s crust is dominated by silicon and oxygen so is categorized into silicate and non-silicate minerals.
2. What is the chemical formula of the copper ore ‘Chalcopyrite’?
a) CuFeS2
b) Cu2S
c) Cu2O
d) CuS
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Explanation: Chemical formula of Chalcopyrite is ‘CuFeS2’. Cu2S, Cu2O and CuS are the chemical formulas for Chalcocite, Cuprite and Covellite respectively.
3. On which of the following factors, tonnage production of a metal does not depend?
a) The richness of ore deposits
b) Physical properties of the metal
c) Chemical properties of the metal
d) The demand of the metal
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Explanation: The tonnage production of a metal depends on the factors like accessibility and richness of ore deposits, physical as well as chemical properties of the metal. It also depends on the nature of extraction and refining of the metals.
4. What type of ore is Pyrite?
a) Oxide
b) Halide
c) Sulphide
d) Nitrate
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Explanation: Pyrite has the chemical composition of iron sulphide (FeS2). It is opaque and metallic in lustre. It forms at high and low temperatures.
5. The sources of metals are earth crust, ocean water and recycled scrap.
a) True
b) False
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Explanation: The most important source of metals is the ore deposits in the Earth’s crust. Ocean water and man-made recycled scrap are other sources.
6. Which among the following is the place of extraction of Galena in India?
a) Jharkhand
b) Gujarat
c) Andhra Pradesh
d) Orissa
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Explanation: Galena has the chemical composition of lead sulphide (PbS). It is hugely extracted in Gujarat, Haryana in India.
7. Which is the most abundant mineral found in the Earth’s crust?
a) Silicates
b) Oxides
c) Sulphides
d) Halides
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Explanation: Silicates makes up approximately 90% of the Earth’s crust. The silicate minerals are generally an ionic compound predominantly of silicon and oxygen atoms.
8. Which among the following metals are rare and are far more expensive compared to other metals.
a) Lead
b) Copper
c) Gold
d) Thorium
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Explanation: Thorium is a weakly radioactive metal which is silvery and tarnishes black when exposed to air. Metals like Thorium, Vanadium are commonly referred to as rare metals. So, among the given options Thorium is rare and far more expensive compared to other metals.
9. Algae, which is a kind of seaweed, has a high concentration of ______
a) Iodine
b) Copper
c) Lead
d) Zinc
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Explanation: Algae is a naturally growing aquatic organism that can conduct photosynthesis. It is a naturally growing seaweed which is an important source of vitamins and is rich in iodine, iron, magnesium and calcium.
10. The East coast of India has one of the world’s largest deposits of ______
a) Sphalerite
b) Corundum
c) Chalcocite
d) Bauxite
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Explanation: The deposits of the East coast of India are rich in gibbsite and has a low content of silica and Titania. Therefore, it is ideal for Bayer’s process which is used for the extraction of alumina.
11. India is the largest producer of Manganese in the world.
a) True
b) False
View Answer
Explanation: Currently India is the third-largest producer of Manganese in the world after USSR and South Africa. The ore deposits of Manganese in India are located in Gujarat, Madhya Pradesh, Maharashtra, Andhra Pradesh, Karnataka, Orissa and Rajasthan.
12. Which ore contains garnets and quartz as the chief gangue materials?
a) Simple ores
b) Ferruginous ores
c) Garnetiferrous ores
d) Complex ores
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Explanation: Garnetiferrous ores contain garnets and quartz as the chief gangue materials. An Electrostatic separation process or floatation can be used to upgrade it.
13. The economy of extraction of ore depends on which of the following factors?
a) Colour of ore
b) Location of ore deposits
c) Shape of ore
d) Magnetic properties of ore
View Answer
Explanation: The economy of the extraction of ore depends on the following fundamental factors: percentage of valuable metal in ore, percentage of impurities in ore, location and magnitude of ore, market value and physical condition of ore.
Sanfoundry Global Education & Learning Series – Extractive Metallurgy.
To practice all areas of Extractive Metallurgy, here is complete set of Multiple Choice Questions and Answers.
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