Metal and Non Metal || Non-Metals

Metal and Non-metal || Metals || Non-metals || Silicon || Sulphur

Q1. Define non-metals with examples.
Ans:
Non metals are the elements which do not conduct heat and electricity and are brittle and non-lustrous. For examples: Nitrogen, Oxygen, Hydrogen, Chlorine, Carbon, Sulphur, etc.

Q2. What is the position of non-metals in modern periodic table?
Ans:
Non metals are kept in group V, VI and VII of modern periodic table.

Q3. Write some physical properties of non-metals.
Ans:
The following are the physical properties of non-metals;

1. Non-metals are brittle so they cannot be changed into thin sheets or drawn into wires.
2. Non-metals are bad conductor of heat and electricity except graphite.
3. They have low melting and boiling point.
4. They are non-sonorous.

Q4. What is sulphur? How is sulphur found in nature? In which state is it found in nature?
Ans:
Sulphur is a non-metal which is yellowish solid. It is found in pure state in nature. Generally, it is found in the volcanic region.

Q5. What is the position of sulphur in modern periodic table?
Ans:
The position of sulphur in modern periodic table is group VIIA and period 3.

Q6. Write the name of source of sulphur in our daily life.
Ans:
In our daily life, sulphur is found in onion, gralic, mustard oil, etc.

Q7. State any four characters of sulphur.
Ans:
The following are the characters of sulphur:

1. It is yellowish shiny solid non-metal.
2. It is insoluble in water.
3. It doesnot react easily with acids.
4. It gives sulphur dioxide when burnt in air.
5. It is bad conductor of heat and electricity.

Q8. Write the uses of sulphur.
Ans:
The following are the uses of sulphur:

• It is used to make sulphuric acid (H₂SO₄)
• It is used in match stick, gun, etc.
• It is used to prepare insecticides.
• It is used in fire cracker also.
• It is used in making skin ointments as it has special anti-fungal properties.

Q9. Define metalliods with examples.
Ans:
The metals which resemble the characteristics of both metals and non-metals are metalloids. For example: Germenium, Boron, Silicon, etc. 

Q10. Where are metalloids found in modern periodic table?
Ans:
Metalloids are in group IVA in modern periodic table. 

Q11. What is the main source of silicon?
Ans:
The main source of the silicon on the earth is sand and silica (silicondioxide S0₂). 

Q12. Write some physical properties of silicon.
Ans:
The following are the properties of silicon:

• Silicon is a metalloids.
• It is both crystalline and amorphous solid.
• The crystal of silicon is poor conductor of electricity but amorphous is insulation.
• Itr doesnot react with air, water and acid.
• It is hard and grey in color.

Q13. Write some uses of silicon.
Ans:
Some uses of silicon are as follows:

• It is used to make glass, earthen pot, etc.
• It is used as semi conductor in electronic devices.
• It is used to polish or while preparing color.
• Its compound of rocks are used to make houses from sandstone, statues.