Unit-11 | Metals | Class-10
Overview: Metals are those elements (except hydrogen) that form electropositive ions by losing their valence electrons. Minerals are those naturally occurring chemical substances containing metals in some amount. Ores are those minerals from which metals can be extracted profitably and conveniently. This is a solved question and answers exercise of class 10 from the metals portion of the chemistry of science.
This is a full solution of Metals chapter of grade 10 students. These solutions will help you score better marks in your boards examination. Questions in group A, B, C and D are worth 1, 2, 3 and 4 marks, respectively.
Questions are taken from Oasis - School Science - Grade 10.
Questions are taken from Oasis - School Science - Grade 10.
Group A
1. Name any two ores of iron.
Answer: Any two ores of iron are Hematite and Magnetite.
2. Write any two physical properties of iron.
Answer: Any two physical properties of iron are:
i) It is a highly malleable and ductile metal.
ii) Its melting point is 1500°C and boiling point is 2500°C.
3. Name the chief ores of aluminium.
Answer: The chief ores of aluminium are: Bauxite, Cryolite and Felspar.
4. Name the chief ores of copper.
Answer: The chief ores of copper are: Copper pyrite, Cuprite Azurite, etc.
5. Write any two physical properties of copper.
Answer: Any two physical properties of copper are:
i) It is highly malleable and ductile.
ii) It's melting and boiling point is 1083°C and 2350°C, respectively.
6. Name any two ores of silver.
Answer: Any two ores of silver are: Argentite and Horn Silver.
7. Write any two physical properties of silver.
Answer: Any two physical properties of silver are:
i) It is highly malleable and ductile.
ii) It's melting and boiling point is 960°C and 1955°C.
8. Where and in which state is gold found in nature?
Answer: Gold is found in alluvial sand, soil or quartz veins in a free state in nature.
9. Write any two physical properties of gold.
Answer: Any two physical properties of gold are:
i) It is highly malleable and ductile.
ii) It's melting point is 1063°C and boiling point is 2530°C.
10. Name the metal that can be obtained from the given ores:
i) Calverite: Gold
ii) Limonite: Iron
iii) Pyrolite: Silver
iv) Haematite: Iron
11. In which parts of Nepal are given metals found? Write.
i) Iron: Lalitpur
ii) Gold: Kathmandu
iii) Magnesium: Udayapur
iv) Cobalt: Palpa
12. Which metal is obtained from bauxite?
Answer: Aluminum metal is obtained from bauxite.
13. Name a metal which can be obtained from Argentite.
Answer: Silver is the metal which can be obtained from Argentite.
14. Which metals can be extracted from Magnetite and Chalcopyrite?
Answer: Iron can be obtained from Magnetite and Copper can be obtained from Chalcopyrite.
Group B
1. Iron is used for making utensils, why?
Answer: Iron is used for making utensils because it is highly malleable and ductile. Due to this property, it can be turned into any shape that we want. Similarly, it is a durable and cheaper material.
2. Aluminium is used for making body parts of an aeroplane, why?
Answer: Aluminium is used for making body parts of the aeroplane because it is a very light metal as compared to the other metals.
3. Copper is used for making electric wires, why?
Answer: Copper is used for making electric wires because it is an excellent conductor of heat and electricity as compared to the other metals.
4. Gold is called an inert metal, why?
Answer: Gold is called an inert metal because it doesn't react with common chemical reagents like air, water, acids, etc in normal temperature and pressure.
5. Write any two differences between iron and aluminium.
Answer: Any two differences between iron and aluminium are:
| Iron | Aluminium |
|---|---|
| Iron is a shiny and grey-white coloured metal. | Aluminium is a bluish-white metal. |
| Its specific gravity is 7.86. | Its specific gravity is 2.7. |
6. Why are gold and silver used for making ornaments?
Answer: Gold and silver are used for making ornaments because both are shiny and less reactive metals. Due to their less reactivity, they can retain their properties for a longer time.
7. Why aluminium tools are not affected by air and water?
Answer: Aluminium tools are covered by a natural layer of Aluminium oxide. Aluminum oxide isn't reactive. Due to this, aluminum tools are not affected by air and water.
8. Aluminium is used to make parts of an aeroplane. Give any two reasons.
Answer: Aluminium is a light-weight and rust-free metal. So, it is used to make parts of an aeroplane.
9. Aluminium is a very reactive metal. However, the foods in aluminium pots don't react with the pots? Give reason.
Answer: Aluminium is a very reactive metal. So, whenever it comes in contact with air or water, it reacts with it and forms Aluminium Oxide. This aluminum oxide isn't reactive and thus, protects the food contained in the pots from reacting with the pots.
10. State any two properties of copper that make it suitable for making pots and pans.
Answer: Copper is malleable and ductile. Its melting point is 1083°C and boiling point is 2350°C. Due to these two properties of copper, it is suitable for making pots and pans.
Group C
1. Write any three uses of iron.
Answer: Any three uses of iron are:
a. It is used to make household utensils.
b. It is used as a catalyst in various chemical reactions.
c. It is used in the manufacture of steel.
2. Write down the major uses of aluminium.
Answer: The major uses of aluminium are as follows:
a. It is used to make household utensils.
b. It is used to make body parts of vehicles and aeroplanes.
c. It is used for making coins, alloys and overhead electric cables.
3. What are the uses of copper?
Answer: Any three uses of copper are as follows:
a. It is used to make household utensils.
b. It is used to make electric wires and cables.
c. It is used for making alloys like brass, bronze, etc.
4. Write any three uses of silver.
Answer: Any three uses of silver are as follows:
a. It is used to make jewellery and other valuable ornaments.
b. It is used to make coins, medals, statues, etc.
c. It is used for silver mirror and filling teeth.
5. Write down the main uses of gold.
Answer: The main uses of gold are as follows:
a. It is used to make jewellery and other valuable ornaments.
b It is used for gold plating.
c. It is used for filling teeth.
6. Write any three utilities of metals in our daily life.
Answer: Any three utilities of metals in our daily life are as follows:
a. It is used to make household utensils.
b. Gold and silver are used to make jewellery and other valuable ornaments.
c. Aluminium and copper are used to make conducting wires.
Group D
1. Write down the electric configuration of iron and mention the position of iron in the modern periodic table.
Answer: The electric configuration and position of iron in the modern periodic table are given below:
| Electric configuration | 1s2,2s2,2p6,3s2,3p6,3d6,4s2 |
| Position in periodic table | Period = 4, Group = 8, Block = d-block |
2. How is iron extracted? Describe in brief.
Answer: Iron is extracted from its chief ore: Haematite. The hematite ore is collected from the ore mines and undergoes metallurgy. In this process, it is crushed and powdered to get a fine powder. Then, the impurities and foreign substances are removed by washing first and then by the electromagnetic separation method. Now, the ore is mixed with coke and heated strongly in a furnace in the presence of excess air below the melting point of iron. After this, the molten iron is obtained which is then further purified and iron metal is extracted from the iron ore.
3. How is gold extracted? Describe in brief.
Answer: Gold is a less reactive metal so, it is found in a free state in nature. It is extracted from alluvial soil or sand rich in gold. The gold-containing soil is mixed with water. and run on a sluice. Then, the particles of the gold get trapped in the cavities of the sluice, which is separated from the sand. In this way, gold is extracted.
4. Arrange aluminium, iron, gold, silver, and copper in the increasing order of their melting and boiling points.
Answer: The arrangement of aluminium, iron, gold, silver, and copper in the increasing order of their melting and boiling points are given below.
| Boiling Points | |
|---|---|
| Aluminium | 1800C |
| Silver | 1955 C |
| Copper | 2350 C |
| Iron | 2500 C |
| Gold | 2530 C |
| Melting Points | |
|---|---|
| Aluminium | 660C |
| Silver | 960 C |
| Gold | 1063 C |
| Copper | 1083 C |
| Iron | 1500 C |
5. Write a short note on occurrence of metals in Nepal.
Answer: Different types of metals are found in different parts of Nepal. But, the chief ores of each metal are lesser in number while for some metals, the chief ores may not be present in Nepal. Metals like Iron, Copper, Gold, Magnesium, Cobalt, Calcium, Bismuth and Lead are abundant here in comparison to other metals. Lalitpur, Udayapur and Makwanpuru are districts having the ores of more than one metal. Overall, ores of metals are found in each region of Nepal.
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Publisher and Distributor: Oasis Publication Pvt. Ltd.
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Author: Jayananda Kapadi
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CLASS 10 QUESTIONS AND ANSWERS FROM CHAPTER 11 - METALS | METALS WORKSHEET WITH SOLUTIONS | IMPORTANT CLASS 10 CHEMISTRY SOLUTIONS
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