NCERT Class 8 Science Chapter 4 Materials : Metals and Non-Metals Extra Questions and Answers
Class 8 Science Chapter 4 Extra Questions and Answers – Materials : Metals and Non-Metals. Here in this Page Class VII Students can Learn Extra Questions & Answer 4th Chapter Science fully Inside.
We Provided Here Materials : Metals and Non-Metals Science Chapter 4 Long Answer Type Question, Very Short Type Questions (VSA) / MCQ Type Questions, Short Type Questions (SA).
Class 8 Science Chapter 4 Extra Question with Answer – Materials : Metals and Non-Metals
Science Chapter 4 Materials : Metals and Non-Metals Class 8 Inside 5 Marks, 3 marks, 2 Marks & And 1 Marks Important Questions and Answers.
1) Fill in the blanks:
a) ____ is a good conductor of electricity. (Copper wire)
b) ____foil used for decorating sweets. (Silver)
c) Metals react with acids to produce ____ gas. (Hydrogen)
d) As metals produce ringing sounds, they are said to be ____. (Sonorous)
2) Multiple choice questions:
a) Phosphorous is very ____ non-metal?
a) Active b) Reactive
Ans. b) Reactive
b) ____foils are used to wrap food items?
a) Aluminum b) Silver
Ans. a) Aluminum
c) ____acid turns blue litmus paper red?
a) Sulfurous acid b) Sulfuric acid
Ans. a) Sulfurous acid
3) Answer the following questions:
a) Write two differences between metal and non-metal.
Ans. The differences between metal and non-metal are,
i.) Metals are lustrous whereas non-metals have no luster.
ii.) Generally, metals are good conductors of heat and electricity but non-metals are poor conductors.
b) Why sodium metal is stored in kerosene?
Ans. Sodium metal is very reactive. It reacts vigorously with oxygen and water. A lot of heat is generated in the reaction. It is, therefore, stored in kerosene.
c) Why phosphorus is stored in water?
Ans. Phosphorous is a very reactive non –metal. It catches fire if exposed to air. To prevent the contact of phosphorous with atmospheric oxygen, it is stored in water.
d) State two uses of non-metals.
Ans. Two uses of non-metals are,
i.) Non-metals used in fertilizers to enhance the growth of plants.
ii.) Non-metals used in water purification process.
4) Match the information of column I with the items of column II:
Column I |
Column II |
a) Metals can be beaten into thin sheets | I) Coal |
b) Metals can be drawn into wires | II) Atom |
c) Soft and dull in appearance | III) Metalloids |
d) The smallest unit of an element | IV) Malleability |
e) Possess character of both metals and non-metals | V) Ductility |
Ans. a) – IV), b) – V), c) – I), d) – II), e) – III).
5) The name of the product formed in the reaction of Sulphur and oxygen is Sulphur dioxide gas. When Sulphur dioxide is dissolved in water sulfurous acid is formed. The reaction can be given as follows:
Sulphur dioxide (SO2) + Water (H2O) Sulfurous acid (H2SO3). The sulfurous acid turns blue litmus paper red. Generally, oxides of non-metals can acidic in nature.
a) The name of the product formed in the reaction of Sulphur and oxygen is _____ gas. (Sulphur dioxide)
b) Generally, oxides of non-metals can ____ in nature. (Acidic)
c) What is the symbol of Sulfurous acid? (H2SO3)
More Extra Questions and Answers
Q.1) Fill in the blanks
- The property of metals by which they can be beaten into thin sheets is called
- metals produce ringing sounds said to be SONOROUS
- Nonmetals are called as poor conductors of heat and electricity.
- Phosphorus is a reactive non metal.
- Metals are malleable and
Q.2) Define the following
- Malleability
Ans : Property of metals by which they can be beaten into thin sheets is called malleability.
- Ductility
Ans :Property of metal by which it can be drawn into wires is called ductility
- Metalloids
Ans :Metalloids are those materials which possess the characteristic of metal as well as non metal
Q.3) Answer the following
1) Write some uses of Nonmetals
Ans :i) Nonmetal is used in water purification process.
ii) Nonmetal is used in fertilisers to enhance the growth of plants.
iii) Nonmetal is used in crackers.
iv)Non metal is used in antiseptic.
2) Write uses of metals.
Ans :i) metal is used in making machinery automobiles.
ii) Metals are used for making kitchen utensils such as water boilers cooking utensils.
iii) Metals are also used in making of aero planes trains and satellites.
iv) Metals are used to manufacture industrial gadgets.
Q.4) Write the chemical formula for the following
1) Copper sulphate – CUS04
2) Iron sulphate – FeSO4
3) zinc sulphate -ZNSO4
4) sulphur dioxide – SO2
5) water – H2o
Q.5) Identify the following as metal or nonmetal
1) Aluminium – Metal
2) oxygen- Non-metal
3) calcium- Metal
4) Iron – Metal
5) sulphur- Non-metal
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