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प्रश्न
Explain the difference.
Crystalline and non-crystalline forms of carbon.
उत्तर
| Crystalline carbon | Non-crystalline carbon |
| A crystalline form has a regular and definite arrangement of atoms. | A Non-crystalline form does not have the regular arrangement of atoms. |
| Their melting point and boiling point are high and specific. | It melts at very high temperatures. |
| Crystalline carbon is a very hard substance. | Non-crystalline carbon is brittle. |
| A crystalline form has a definite geometrical shape, sharp edges and plane surfaces. | They are amorphous, hence, they do not have definite geometrical shape. |
| Diamond, graphite and fullerene are different crystalline forms of carbon. | Coal, charcoal and coke are different non-crystalline/amorphous forms of carbon. |
APPEARS IN
संबंधित प्रश्न
Fill in the blank.
............. is the hardest substance that occurs naturally.
Define the Following Term:
Crystal
Answer the following question
Why is diamond very hard?
Answer the following question
What impurity is present in black diamond?
Fill in the blank:
......... is the most inferior form of coal.
Write ‘true’ or ‘false’ against the following statement:
Wood charcoal is an important constituent of gun powder.
What is destructive distillation? What are the products formed due to the destructive distillation of coal?
Name the products formed when:
diamond is burnt in air at 900°C.
Tick the most appropriate answer.
Diamond and graphite are
a. metals.
b. organic compounds,
c. alkenes.
d. allotropes.
Tick the most appropriate answer.
Which of the following is an amorphous form of carbon?
a. graphite
b. fullerenes
b. diamond
d. coal
Tick the most appropriate answer.
Which form of carbon is a good conductor of electricity?
a. graphite
b. diamond
c. coke
d. amorphous carbon
Tick the most appropriate answer.
Fuel gases like water gas and producer gas are manufactured from
a. bone charcoal
b. wood charcoal
c. coke
d. none of these
FILL IN THE BLANK
.............. is used to make carbon brushes in dynamos.
TRUE \ FALSE
Synthetic diamonds are used for cutting glass and drilling rocks.
TRUE \ FALSE
Graphite is a poor conductor of electricity.
Name the following:
A crystalline allotrope of carbon built up from a hexagonal unit.
Name the following:
An allotrope of carbon used for the manufacture of coke.
Name the following:
An amorphous allotrope of carbon which floats on water.
Select the appropeiate option of the following statement:
An allotrope of carbon used as a tip for deep boring drills.
