Last updated on February 6th, 2024 at 12:52 pm
Say whether the following statements are correct or wrong. Correct the wrong statements.
1. Both graphite and diamond have the same element, carbon in it. [Correct]
2. Diamond is a good conductor of electricity.[Wrong]
(Corrected: Diamond is a poor conductor of electricity.)
3. The light blue zone in flame is in the middle of the flame.[Wrong]
(Corrected: The light blue zone in the flame is at the outermost part of the flame.)
4. Combustion doesn’t take place in the outer zone of the flame.[Wrong]
(Corrected: Combustion takes place in all zones of the flame, including the outer zone.)
5. Carbon dioxide is of alkaline nature.[Wrong]
(Corrected: Carbon dioxide is an acidic oxide, not alkaline.)
Match the following :-
- Lamp black and charcoal: Carbon allotrope
- Made of 60 carbon atoms: Fullerene
- Hardest substance: Diamond
- Dry ice: Solid carbon dioxide
- Combustion: Oxidation
Answer the following questions :-
(1) What do you understand by allotropy? What are the different allotropes of carbon? Write two uses of each?
Different forms of an element having different physical properties but the same chemical properties are called allotropes. In this way the property of an element having different forms is called allotropy.
(2) How will you differentiate between graphite and diamond?
Graphite:
Made up of layers of carbon atoms arranged in hexagonal rings.
Soft and slippery to the touch.
Conducts electricity due to delocalized electrons between layers.
Diamond:
Consists of carbon atoms arranged in a tetrahedral lattice structure.
Extremely hard and has a crystalline structure.
Does not conduct electricity due to its tightly bound carbon atoms.
(3) What is Fullerene? What are its main uses?
Fullerene is a carbon allotrope composed of carbon atoms arranged in closed, hollow cages or tubes.
Main uses of Fullerene include:
Nanotechnology,Electronics,Medical applications.
(5) What is dry ice? What are its important uses?
Dry ice is solid carbon dioxide (co2)at temperatures below -78.5°C.
Important uses of dry ice include:
Cooling agent,Special effects,Industrial cleaning,Carbonation.
