Metals : Class 10 Science Notes And Exercise - Chapter 11

Metals Class 10 Science Complete Notes and Exercise. This note include all the excercise given in metals chapter of science book. #Chapter11

Metals Class 10 Science Complete Note And Exercise. Unit 11

 Hello Everyone! Today in this article we are going to provide you Notes and Exercise of Metals of chapter 11, class 10.

This note include all the exercise such as question answer, give reason, numericals, diagrammatic questions and define the following of Metals chapter of science book.

So let's start:

Chapter - 11  
Metals

2. Give Reason 
a. Iron is not found in a free state.
Ans: Iron is not found in a free state because iron is quite reactive metal it easily combines with other metals to form oxide.

b. Gold is called the king of metals.
Ans: Gold is called the king of metals because it is not found easily everywhere like other metals. It is very rare and so that it is very costly.  It does not react with air, water, acid, base and other chemicals.

c. The part of aeroplane is made of aluminium but not by iron.
Ans: The part of aeroplane is made of aluminium but not by iron because aluminium doesn't get rust and it is a light metal.

d. Copper is not found in a free state.
Ans: Copper is not found in a free state because it easily react with other elements to form compounds.

e. Coinage metals are grouped together in the group IB in the periodic table.
Ans: Coinage metals are grouped together in the group IB in the perotic table because the coinage metals like gold due to the presence of d orbital in their valence shell.

f. Gold and Silver are found in a native state.
Ans: Gold and silver are found in a native state because gold and silver does not react with air, water, acids, base and other chemicals in normal pressure and temperature.

g. Foods are wrapped in aluminium foil though it is a highly reactive metal.
Ans: Foods are wrapped in aluminium foil though it is a highly reactive metal because it form thin layer of aluminium oxide ( which is hard, passive and impervious to air and water ) on all over the surface of metal. Hence, aluminium is used to protect food from being spoiled.
Questions Answers of class 10 Science Chapter 11 : Metals

Questions Answers of class 10 Science Chapter 11 : Metals 

3. Answer the following questions.
a. Write any two features of metals
Ans: Any two features of metals are:-
i. Iron is a shiny and grayish white metal.
ii. It is a good conductor of heat and electricity.

b. Why are metals electropositive in nature?
Ans: Metals are electropositive in nature because they can easily lose their valence electron from their outermost shell.

c. Write down the position of iron in periodic table with the help of its electronic configuration.
Ans: Iron is located in group VIII/8 and period 4 in the perodic table.   
Electronic Configuration Of Iron 
ShellKLMN
 No. of Electron14 
 Sub-Shell 1s²2s⁶ 2p⁶ 3s² 3p⁶ 3d⁶
 4s²

d. What are the physical properties of iron? Why is iron called metal ?
Ans: The physical properties of iron are as follows :
i. Iron is a shiny and grayish white metal.
ii. It is malleable and ductile.
iii. It is a good conductor of heat and electricity.
Iron is called metal because it is malleable and ductile and has high density and hard.

e. List any two names of different ores of the following metals. 
Ans:
i. Iron
  • Haematite 
  • Magnetite
ii. Aluminium
  • Bauxite 
  • Cryolite 
iii. Silver
  • Argentite
  • Horn silver 
iv. Copper
  • Cuprite
  • Chalcocite 
v. Gold
  • Sand alluvial soil
  • Native or free gold
f. The external cover of aeroplane is made from aluminium instead of iron? Why?
Ans: The external cover of aeroplane is made of aluminium instead of iron because aluminium doesn't get rust and it is a light metal.

g. Write any four uses of the following metals.
i. Iron
  • It is used for making rods
  • It is used for making household utensils
  • It is used in the manufacture of steel 
  • It is used in the construction of buildings
ii. Aluminium
  • It is used for making utensils
  • It is used for making electric wire
  • It is used for making coins and alloys 
  • It is used for making aluminium foil
iii. Copper
  • It is used for making electrical goods and cables
  • It is used to make household utensils.
  • It is used for electroplating and electrotyping
  • It is also used to make coins, ornaments and jewellery.
iv. Silver
  • Silver is used to make jewellery, coins and decorative articles.
  • It is used industrially in electrical contacts and conductors.
  • It is used in photographic films and x-rays.
  • It is also used in medicine.
V. Gold 
  • Gold is used for making Jewellery, statues and ornaments.
  • It is used for gold plating.
  • It is used in dentistry.
  • It is used for making gold leaf electroscope.

h. What are Coinage metals? How are they different from other metals?
Ans: Coinage metals are those metals which are used for making coins and jewellery  They are different from other metals because they are used for making jewellery as they are malleable and ductile. 

i. Why gold and silver used for making jewellery.
Ans: Gold and silver are used for making jewellery because they are malleable and ductile.

j. Which metal can be extracted from the ore of bauxite and Haematite?
Ans: Aluminium can be extracted from the ore of bauxite and Iron can be extracted from the ore of Haematite.

k. What is the use of aluminium foils?
Ans: The use of aluminium foil is to cover food, Polish your silver, Preserve steel-wool pads, cigarette, Pharmaceutical products etc and to prevent the air and water to enter inside.

l. Which metal is extracted from chalcocite? Why is this metal used in making electric cable? Write any three metals used in making electric cable? Write three any uses of it?
Ans: Copper can be extracted from chalcocite. It is used in making electric cable because it is a good conductor of electricity.
The three metals used in making electric cables are :
  • Copper
  • Aluminium
  • Gold
Uses of copper
  • It is used for making electrical goods and cables
  • It is used to make household utensils.
  • It is used for electroplating and electrotyping
  • It is also used to make coins, ornaments and jewellery.
Uses of Aluminium 
  • It is used for making utensils
  • It is used for making electric wire
  • It is used for making coins and alloys 
  • It is used for making aluminium foil
Uses of Gold
  • Gold is used for making Jewellery, statues and ornaments.
  • It is used for gold plating.
  • It is used in dentistry.
  • It is used for making gold leaf electroscope.

m. Arrange the following metals in ascending order according to the reactivity. Gld, Iron, Aluminium, Silver, Copper
Ans: Metals are arranged according to their reactivity.
  • Gold
  • Silver
  • Copper
  • Iron
  • Aluminium

n. Write down the symbol, atomic number, atomic mass, orbital electronic configuration and valency of :
Ans:
i. Iron
  • Atomic Symbol: Fe
  • Atomic number: 26
  • Atomic Mass: 55.84 (56)
  • Valency: 2 (ferrous) and 3 (feric)
  • Electronic Configuration: 1s², 2s², 2p², 3s², 3p⁶, 4s², 3d⁶

ii. Aluminium
  • Atomic Symbol: Al
  • Atomic No. 13
  • Atomic mass: 27
  • Valency : 3
  • Electronic Configuration : 1s², 2s², 2p⁶, 3s², 3p¹

iii. Copper 
  • Atomic sysmbol: Cu
  • Atomic No: 29
  • Atomic Mass: 63.57 (64)
  • Valency: 1 and 2
  • Electronic Configuration: 1s², 2s², 2p⁶, 3s², 3p⁶, 4s¹, 3d¹⁰

iv. Silver
  • Atomic Symbol: Ag
  • Atomic No: 47
  • Atomic mass: 108
  • Valency: 2
  • Electronic Configuration: 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s¹, 4d¹⁰

v. Gold
  • Symbol : Au
  • Atomic No. 79
  • Atomic mass: 197
  • Valency: 2 (aurous), 3 (auric)
  • Electronic Configuration: 1s², 2s², 2p6, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s¹, 4f¹⁴, 5d¹⁰

o. Write in brief about the occurance of metals in Nepal?
Ans: More than 80 types of minerals are reported to be found in a large amount in different parts of Nepal. Some of them are iron, Copper, gold etc. Iron ore is found in lalitpur, Tanahun, chitwan etc. Gold ores are found in river rapti, river Sunkoshi etc.

p. Define

a. Ore
Ans: The minerals from which metals can be extracted efficiently for commerical purposes is known as ores.

b. Minerals
Ans: A mineral is a naturally occurring inorganic element or compound having an orderly internal structure and characteristic chemical composition, crystal form, and physical properties.

c. Coinage metal
Ans: Those metals which are used for making coins and jewellery is known as coinage metal.

Conclusions

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Disclaimer

PLAGIARISM STATEMENT

I certify that this assignment/report is my own work, based on my personal study and/or research and that I have acknowledged all material and sources used in its preparation, whether they be books, articles, reports, lecture notes,  and any other kind of document, electronic or personal communication. I also certify that this assignment/report has not previously been submitted for assessment in any other unit, except where specific permission has been granted from all unit coordinators involved, or at any other time in this unit, and that I have not copied in part or whole or otherwise plagiarised the work of other students and/or persons.

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