Metal and Non metal || Metal

Metal and Non-metal || Copper || Aluminium || Gold || Silver

Q1. What is metal? Write its examples.
Ans:
Metals are those electropositive elements which are good conductor of heat and electricity. For examples: Aluminium, Silver, Gold, Iron, Copper, Mercury, etc.
Q2. Where are metals kept in modern periodic table?
Ans:
Metals are kept in group I, II and III in modern periodic table.
Q3. Where are very active metals kept in modern periodic table?
Ans:
Very active metals are kept in group I and group II of modern periodic table.
Q4. State the physical properties of metal.
Ans:
The following are the properties of metal:

1. A metal is good conductor of heat and electricity.
2. Metals are malleable.
3. A metal has the property of ductility.
4. A metal shines brightly when freshly cut.This is called lustrous.

Q5. Write the specific position of gold in modern periodic table.
Ans:
Gold belongs to group IB and period 6 in periodic table.
Q6. Gold is found freely in nature, why?
Ans:
Gold is found in free state in nature because it does not react with other elements easily.
Q7. Where is gold found?
Ans:
Gold is usually found with quartz in rocks or in alluvial sands.
Q8. Gold is called coinage metal, why?
Ans:
Gold is used to make coin or jewelry or medals so it is called coinage metal.
Q9. Write any four important characteristics of gold.
Ans:
The following are the characteristics of gold;

• It is yellow coloured shiny metal.
• It is good conductor of heat and electricity.
• It is inactive metal.
• It does not react with air and water.

Q10. Mention some uses of gold.
Ans:
The following are the uses of gold;

• It is used in maing coins, jewellery, metals, etc.
• It is used in making statues and for filling teeth.
• Compounds of gold are used in laboratory, photography and medicines.

Q11. Gold is called the king of metal, why?
Ans:
Gold is the most malleable and ductile metal so it is called the king of metal.
Q12. Write the position of silver in modern periodic table.
Ans:
Silver belongs to the group IB and period 5 in modern periodic table.
Q13. What is the state of silver in nature?
Ans:
We can find the silver in free state as well as in combined states.
Q14. What are minerals and ores?
Ans:
Minerals are those naturally occuring chemical substances which contains less or more metals.
The minerals that contains more amount of metals and used to extract them are called ores.
Q15. State four physical properties of silver.
Ans:
The following are the properties of silver:

1. Silver is a white shining metal.
2. It is the best conductor of heat and electricity among metals.
3. It does not react with air and water.
4. It does not combine with dilute acids but combines with concentrated acids.

Q16. Write the uses of silver.
Ans:
The uses of silver are;

1. It is used to make valuable utensils, jewellery, coins, medals, etc.
2. Silver bromide is used in photography.
3. It is used to fill the gaps in teeth.
4. It is used in silver plating over a cheap metal.

Q17. Write the group and period of copper in modern periodic table.
Ans:
Copper belongs to group IB and period 4 in periodic table.
Q18. Mention the physical properties of copper.
Ans:
The physical properties of copper are as follows:

• It is readish brown metal.
• It does not rust but it becomes dim in moisture.
• It formers black oxide when heated.
• It reacts with acids.

Q19. Write any three uses of copper.
Ans:
The following are the three uses of copper:

1. It is used to make utensils, electric wire, etc.
2. It is used to make alloys like brass, bronze, etc.
3. Its salts are used to prepare insecticides and pesticides.

Q20. Mention the position of iron in modern periodic table.
Ans:
Iron falls in group VIII and period 4 in modern periodic table. Q21. What is the state of iron in nature?
Ans:
The iron is found mostly combined states in nature.
Q22. What are the main ores of iron (Fe)?
Ans:
The main ores of iron are haematite and magnetite.
Q23. Write the physical properties of iron.
Ans:
The following are the physical properties of iron:

• It is good conductor of heat and electricity.
• It becomes a strong magnet magnet when magnetized.
• It rusts in the presence of air and moisture.
• It reacts with acids.

Q24. List out the main uses of iron.
Ans:
The following are the uses of iron:

• It is used for making rods, pipes, chains, bolts, etc.
• It is used to make agricultural tools, weapons, vehicles, etc.
• It is used to manufacture steel.
• It is used in medicine for iron tablets to reduce the deficiency of iron.

Q25. Write the valency and symbol of aluminium.
Ans:
Aluminium has symbol 'Al' and valency 3.
Q26. What is the main ore of aluminium?
Ans:
The main ore of aluminium is bauxite through which it is extracted.
Q27. Write some physical characters of aluminium.
Ans:
Some physical characteristcs of aluminium are:

1. It is bluish white lustrous metal.
2. It is good conductor of heat and electricity.
3. It is not affected by air and water easily.
4. It is light metal.

Q28. Mention the uses of aluminium.
Ans:
The following are the uses of aluminium:

1. It is used to make presure cooker, rice cooker, etc.
2. It is used to make the body of aeroplane.
3. It is used to make the wire net, coin or electronic appliance.
4. It is used in wrapping the food items like biscuit, chocolate or packling the food to remain hot for long time.

Q29. Aluminium is used to make an aeroplane;s body, why?
Ans:
Aluminium is light metal and doesnot react with air and water so to reduce the weight of aeroplane and to avoid rusting it is mostly used in aeroplane.