Short answer type questions
1. How is graphite prepared?
2. Name four characteristics that determine the value of a diamond.
3. Write two differences between diamond and graphite.
4. State reasons for the occurrence of allotropy in nature.
5. Name the allotropic form of carbon which is used:
for removal of cataract.
b. in making carbon brushes of electric motors.
as a catalyst.
d. to filter aquarium water.
e.as a filler in the manufacture of rubber tyres.
Answers
Answer:
Ans.1) The Graphite Prepared From Petroleum Coke After It Is Mixed With Coal Tar Pitch.
Ans.2) The Four Characteristics That Determine The Value Of Diamonds Are (i)Carat (ii) Colour (iii)Clarity And (iv)Cut.
Ans.3) Differences Between Diamond And Graphite -
Diamond - (i) It Has Crystalline Nature.
(ii) It Is An Electrical Insulator.
Graphite - (i) It Has Layered Structure.
(ii) It Is Good Conductor Of Electricity.
Ans.4) State Reasons For The Occurrence Of Allotropy In Nature Because Of Structurally Different Forms Of The Same Element Due To It"s Valency.
Ans.5)
(A) For Removal Of Cataract - (i)diamond, (ii) graphite, (iii) Fullerite.
(B) Amorphous Is Used For Making Carbon Brushes Of Electric Motors.
As A Catalyst.
(C) Activated Carbon OR Carbonaceous Is Used To Filter Aquarium Water.
(D) Carbon Black Is Used As A Filler In The Manufacture Of Rubber Tyres.
Explanation:
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