Class X Science (SEBA)
Lesson 3: Metals and Non-Metals – Set 1
1. Which metal is stored in kerosene oil?
Answer: Sodium and potassium are stored in kerosene oil because they react very quickly with air and water.
2. Name a metal which is liquid at room temperature.
Mercury is a metal that remains liquid at room temperature.
3. Which property of metals allows them to be drawn into wires?
The property is called ductility.
4. What happens when magnesium ribbon is burnt in air?
Magnesium burns with a dazzling white flame and forms magnesium oxide ash.
5. Which gas is produced when zinc reacts with dilute hydrochloric acid?
Hydrogen gas is produced during the reaction.
6. Name the hardest natural substance.
Diamond is the hardest natural substance known.
7. Why are metals good conductors of electricity?
Metals contain free electrons that allow electric current to pass through them easily.
8. What is an alloy?
An alloy is a homogeneous mixture of two or more metals or a metal and a non-metal.
9. Name the metal extracted from bauxite ore.
Aluminium is extracted from bauxite ore.
10. Why is gold used for making jewellery?
Gold is used for making jewellery because it is lustrous, non-corrosive, and highly malleable.
Class X Science (SEBA)
Lesson 3: Metals and Non-Metals – Set 2
1. What is the nature of metal oxides?
Most metal oxides are basic in nature.
2. Name a non-metal that is lustrous.
Iodine is a lustrous non-metal.
3. Which metal is used for making electric wires?
Copper is commonly used for making electric wires because it is a very good conductor of electricity.
4. What happens when iron reacts with steam?
Iron reacts with steam to form iron oxide and hydrogen gas.
5. Why are non-metals poor conductors of electricity?
Non-metals generally do not have free electrons for the flow of electric current.
6. Which gas is evolved when metals react with acids?
Hydrogen gas is evolved when metals react with dilute acids.
7. Name the process of coating iron with zinc.
The process is called galvanization.
8. What is the chemical formula of rust?
The chemical formula of rust is hydrated iron oxide, Fe₂O₃·xH₂O.
9. Which non-metal is essential for respiration?
Oxygen is essential for respiration.
10. Why is aluminium used in cooking utensils?
Aluminium is used in cooking utensils because it is light, conducts heat well, and resists corrosion.
Class X Science (SEBA)
Lesson 3: Metals and Non-Metals – Set 3
1. What is malleability?
Malleability is the property by which metals can be beaten into thin sheets.
2. Name the non-metal used in water purification.
Chlorine is used in water purification.
3. Which metal is the best conductor of electricity?
Silver is the best conductor of electricity.
4. Why do metals produce sound when struck?
Metals produce sound because they are sonorous in nature.
5. Name a metal that can be cut with a knife.
Sodium can be easily cut with a knife because it is very soft.
6. What is corrosion?
Corrosion is the gradual destruction of metals due to reaction with air, moisture, or chemicals.
7. Which non-metal is used in fertilizers?
Nitrogen is widely used in fertilizers.
8. What is the colour of copper sulphate solution?
Copper sulphate solution is blue in colour.
9. Why are metals generally hard?
Metals are generally hard because their atoms are closely packed with strong metallic bonds.
10. Name the metal used in thermometers.
Mercury is used in thermometers.
Class X Science (SEBA)
Lesson 3: Metals and Non-Metals – Set 4
1. Which metal is used in aircraft manufacturing?
Aluminium is widely used in aircraft manufacturing because it is light and strong.
2. What happens when copper is exposed to moist air for a long time?
Copper develops a green coating of basic copper carbonate on its surface.
3. Which non-metal is used in pencils?
Graphite, a form of carbon, is used in pencils.
4. Name the property due to which metals can be hammered into sheets.
This property is called malleability.
5. Why is sodium kept under kerosene oil?
Sodium is kept under kerosene oil to prevent it from reacting with air and moisture.
6. Which gas is formed when metals react with water?
Hydrogen gas is generally formed when metals react with water.
7. Name the metal present in haemoglobin.
Iron is present in haemoglobin.
8. What is the colour of silver chloride after exposure to sunlight?
Silver chloride turns grey after exposure to sunlight.
9. Which metal is commonly used in electric bulbs?
Tungsten is used in electric bulbs because it has a very high melting point.
10. Why are alloys used instead of pure metals?
Alloys are used because they are generally stronger and more resistant to corrosion than pure metals.
Class X Science (SEBA)
Lesson 3: Metals and Non-Metals – Set 5
1. Which metal is used for making food cans?
Tin is used for making food cans because it is resistant to corrosion.
2. Name the non-metal that exists in liquid state.
Bromine is the only non-metal that exists in liquid state at room temperature.
3. What is the reaction between iron and copper sulphate solution called?
It is called a displacement reaction.
4. Which metal is used in making jewellery besides gold?
Silver is also widely used in making jewellery.
5. Why do aluminium utensils not corrode easily?
Aluminium forms a protective oxide layer on its surface which prevents corrosion.
6. Which non-metal is used in crackers?
Sulphur is commonly used in crackers.
7. What happens when zinc reacts with copper sulphate solution?
Zinc displaces copper from copper sulphate solution and forms zinc sulphate.
8. Name the process of extracting metals from ores.
The process is called metallurgy.
9. Which metal is used for galvanizing iron?
Zinc is used for galvanizing iron.
10. Why are metals generally shiny?
Metals are shiny because they reflect light from their surface.
Class X Science (SEBA)
Lesson 3: Metals and Non-Metals – Set 6
1. Which metal is used in electric heaters?
Nichrome is used in electric heaters because it has high resistance and a high melting point.
2. Name the non-metal used in matchsticks.
Phosphorus is used in matchsticks.
3. What is the main ore of aluminium?
Bauxite is the main ore of aluminium.
4. Why is copper used in electrical wiring?
Copper is used because it is a very good conductor of electricity and is ductile.
5. Which metal is the least reactive?
Gold is one of the least reactive metals.
6. What is formed when sulphur burns in air?
Sulphur dioxide gas is formed when sulphur burns in air.
7. Name the process by which a metal gains electrons.
The process is called reduction.
8. Which metal is used in water pipes?
Iron and copper are commonly used in water pipes.
9. Why are non-metals generally brittle?
Non-metals are generally brittle because their particles are not arranged in layers like metals.
10. Which metal is extracted from cinnabar ore?
Mercury is extracted from cinnabar ore.
Class X Science (SEBA)
Lesson 3: Metals and Non-Metals – Set 7
1. Which metal is used in making railway tracks?
Iron is mainly used in making railway tracks because of its strength and durability.
2. Name the non-metal essential for plant growth.
Nitrogen is essential for plant growth.
3. What is the chemical symbol of silver?
The chemical symbol of silver is Ag.
4. Why are metals good conductors of heat?
Metals have free electrons that transfer heat energy quickly.
5. Which metal is used in making coins?
Copper and nickel are commonly used in making coins.
6. What is formed when carbon burns in oxygen?
Carbon dioxide gas is formed when carbon burns in oxygen.
7. Name the process of preventing rusting.
Painting, oiling, galvanization, and greasing are methods used to prevent rusting.
8. Which non-metal is used in the manufacture of sulphuric acid?
Sulphur is used in the manufacture of sulphuric acid.
9. Why is graphite used in electrodes?
Graphite is used in electrodes because it conducts electricity.
10. Which metal is present in stainless steel?
Chromium is present in stainless steel along with iron and nickel.
Class X Science (SEBA)
Lesson 3: Metals and Non-Metals – Set 8
1. Which metal is used in making cooking vessels?
Aluminium and copper are commonly used in making cooking vessels.
2. Name the non-metal used in making fertilizers.
Nitrogen is widely used in making fertilizers.
3. What is the chemical formula of aluminium oxide?
The chemical formula of aluminium oxide is Al₂O₃.
4. Why is gold considered a noble metal?
Gold is considered a noble metal because it resists corrosion and does not react easily with air or water.
5. Which metal is used in making electric transmission wires?
Aluminium is commonly used in electric transmission wires.
6. What is formed when calcium reacts with water?
Calcium hydroxide and hydrogen gas are formed when calcium reacts with water.
7. Name the alloy made from copper and zinc.
Brass is the alloy made from copper and zinc.
8. Which non-metal is used in electric batteries?
Carbon in the form of graphite is used in electric batteries.
9. Why are metals generally solid at room temperature?
Metals are generally solid because of strong metallic bonding between their atoms.
10. Which metal is used in making utensils and foils?
Aluminium is used in making utensils and foils.
Class X Science (SEBA)
Lesson 3: Metals and Non-Metals – Set 9
1. Which metal is used in making jewellery and ornaments?
Gold and silver are widely used in making jewellery and ornaments.
2. Name the non-metal used in disinfecting drinking water.
Chlorine is used in disinfecting drinking water.
3. What is the colour of copper metal?
Copper metal is reddish-brown in colour.
4. Why are metals sonorous?
Metals are sonorous because they produce a ringing sound when struck.
5. Which metal is used in making electrical switches?
Copper and brass are commonly used in making electrical switches.
6. What happens when iron is left exposed to moist air?
Iron reacts with moisture and oxygen to form rust.
7. Name the alloy made from copper and tin.
Bronze is the alloy made from copper and tin.
8. Which non-metal is used in making sulphuric acid?
Sulphur is used in making sulphuric acid.
9. Why is stainless steel preferred for utensils?
Stainless steel is preferred because it is strong, durable, and resistant to rusting.
10. Which metal is commonly used in batteries?
Zinc is commonly used in batteries.
Class X Science (SEBA)
Lesson 3: Metals and Non-Metals – Set 10
1. Which metal is used for making electrical cables?
Copper is mainly used for making electrical cables because of its excellent conductivity.
2. Name the non-metal that is essential for breathing.
Oxygen is essential for breathing.
3. What is the chemical symbol of iron?
The chemical symbol of iron is Fe.
4. Why are metals ductile?
Metals are ductile because their atoms can slide over one another without breaking.
5. Which metal is used in making overhead electric wires?
Aluminium is used in making overhead electric wires.
6. What happens when magnesium burns in oxygen?
Magnesium burns with a bright white flame and forms magnesium oxide.
7. Name the process of coating iron with chromium.
The process is called chrome plating.
8. Which non-metal is used in pencil leads?
Graphite, a form of carbon, is used in pencil leads.
9. Why are metals preferred for making machinery?
Metals are preferred because they are strong, hard, and durable.
10. Which metal is commonly used for electroplating?
Chromium and silver are commonly used for electroplating.