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Chapter 4 - Materials : Metals and Non Metals Class 8 questions

In this page we have Chapter 4 - Materials : Metals and Non Metals Class 8 questions . This included Fill in the blanks, Match the column, Short answer type , True and false and Jumbled word questions.Hope you like them and do not forget to like , social share and comment at the end of the page.

Fill in the blanks:

Question 1.
Metal react with oxygen to produce _________oxides and non-metal react with oxygen to produce_________oxides.
Question 2.
The presence of _________ and _________are necessary for iron to rust.
Question 3.
_________is used for making X-ray shields.
Question 4.
_________non-metals is used in fluorescent bulbs to display advertisements.
Question 5.
_________element is used for making pencil lead.
Question 6.
_________and _________are lustrous non-metals.
Question 7.
_________is the only non-metals that exist as liquid at room temperature.
Question 8.
The property of metals by which it can be beaten into sheets is called_________
Question 9.
_________metal can be cut with knife.
Question 10.
_________non-metal is used for vulcanisation of rubber.
Question 11.
_________metal is used in processed food packaging.
Question 12.
Process of coating metals with zinc is called_________
Question 13.
Elements that possess properties of both metals and non-metals are called_________
Question 14.
_________is a pure chemical substance consisting of only one type of atoms.
Question 15.
Metal react with dilute acids to form_________ and_________

Answer

1. Basic, acidic
2. Air, water
3. Lead
4. Neon
5. Graphite
6. Graphite, iodine
7. Bromine
8. Malleability
9. Sodium
10. Sulphur
11. Nitrogen
12. Galvanization
13. Metalloid
14. Element
15. Salt, hydrogen gas

Short answers

Question 1.
Why is gold used for making jewellery?

Answer

Gold does not easily react with other substances. It is an unreactive metal and once polishes, it retains their shine for a long time, therefore, it is used for making jewellery.

Question 2.
What do you mean by corrosion?

Answer

Corrosion is used to describe the process by which minerals such as metals are slowly eaten away when exposed to air and moisture.

Question 3.
No gas is released when sulphur is added to dilute HCl?

Answer

No gas is releases when sulphur is added to dilute HCl because non-metals do not react with dilute HCl and sulphur is a non-metal.

Question 4.
Why are electrical cables made from copper?

Answer

Since copper is a good conductor of electricity, it is used in electrical cables.

Question 5.
Why do copper vessels develop a greenish layer when exposed to moist air?

Answer

Copper vessel gets corroded in the presence of moist air that is carbon dioxide and water to form green coating of a substance called basic copper carbonate.

Question 6.
Which non-metal is considered to be backbone of the electronics industry?

Answer

Silicon is considered to be the backbone of electronics industry.

Question 7.
Why is sodium metal stored under kerosene?

Answer

Sodium metal which react vigorously with the oxygen present in air at room temperature to form sodium oxide. Hence, sodium is stored under kerosene to prevent its reaction with oxygen and moisture present in air.

Question 8. Write the difference between metal oxides and non-metal oxides?

Answer

Metal oxides formed are basic in nature, when dissolved in water they form bases which turn red litmus into blue whereas non-metal oxides are acidic in nature, when dissolve in water they form acids which turn blue litmus into red.

Question 9.
Silver is more likely to tarnish near a petroleum refinery than in a place far away? Explain why?

Answer

Silver does not get easily corroded in unpolluted air, however, if the air is polluted with sulphur compounds such as hydrogen sulphide then silver reacts with it to form a black coating of silver sulphide.

Question 10.
What are noble metals?

Answer

Silver and gold are present at the bottom of the reactivity series of metals. They are unreactive metals and do not react with water, acids and alkalis. They therefore, occur n free state in nature. So they are noble metals.

Question 11.
What is other metal except iron which gets rusted?

Answer

Copper is the metal other them iron which gets rusted in moist air.In the presence of carbon dioxide and water, copper gets corroded or rusted to form a green coating. This green coating is a mixture of copper hydroxide and copper carbonate.

True and False Statement

(a) Metals are good conductor of electricity but poor conductor of heat.
(b) The property of metals by virtue of which they can be drawn into wires is called ductility.
(c) Articles made of metals produce ringing sound when struck hard.
(d) A less reactive metal replaces a more reactive metal from its salt solution in water.
(e) Oxides of non-metals and metals are acidic in nature.
(f) All metals are hard and strong.

Answer

(a) F
(b) T
(c) T
(d) F
(e) F
(f) F

Very Short Answer type

(a)Which non-metal is essential for our life and all living beings inhale it during breathing?
(b) Name the ingredient of the alloy Stainless Steel
(c)Which non-metal is used to disinfect water?
(d) Name two major non-metals which are present in fertilisers and enhance the growth of plants.

Answer

(a) Oxygen
(b) Iron and chromium
(c) Chlorine
(d) Nitrogen and Phosphorous

Fill in the blanks

1. __________________ reacted with oxygen only if ignited.
2. Metals are solids at __________________ temperature, except mercury, which is liquid at __________________ temperature.
3. Non-metals are gases or solid at room temperature, except _____ which is liquid at room temperature.
4. __________________ is the best conductor of electricity followed by gold and aluminium.
5. We use __________________ to pack food.
6. With the exceptions of __________________,_____ and _____ most of the metals have high melting and boiling point.
7.Non-metals have _____ melting point and boiling point.
8. Question: __________________ and ______react with oxygen vigorously at room temperature and they are kept in ____ to prevent oxidation
9. The property by which metals can be drawn into wires is called _______
10. __________________ metal does not burn in dry air even on strong heating.
11. Non-metals do not have lustre except __________________ and ______.
12. ______ is a metalloid.

Answer

1. Magnesium
2. room
3. bromine
4. Copper
5. aluminium foil
6. sodium ,potassium and mercury
7. low
8. Sodium, potassium, kerosene.
9. ductility
10. Iron
11. iodine and graphite
12. antimony

Jumbled word

Answer

a. MALLEABILITY
b. METALLOIDS
c. DUCTILITY
d. SONOROUS
e. CONDUCTOR
f. HARDNESS

Summary

This metals and non metals class 8 questions is prepared keeping in mind the latest syllabus of CBSE . This has been designed in a way to improve the academic performance of the students. If you find mistakes , please do provide the feedback on the mail.

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