Chemistry
A crystalline form of carbon is
- lamp black
- gas carbon
- sugar
- fullerene
Carbon
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Answer
Fullerene
Reason — Fullerene is a crystalline form of carbon.
Lamp black is amorphous carbon. Gas carbon is amorphous carbon. Sugar is not an elemental form of carbon.
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Related Questions
In combined state, carbon occurs as
- coal
- diamond
- graphite
- petroleum
Graphite is used to make crucibles because it is:
- a good conductor of electricity
- a good conductor of heat
- soft and slippery
- has high melting point
Diamond is used for
- making the electrodes of electric furnaces.
- making crucibles for melting metals.
- cutting and drilling rocks and glass.
- making carbon brushes for electric motors.
Carbon forms innumerable compounds because:
P. it has four electrons in its outermost shell.
Q. it behaves as a metal as well as a non-metal.
R. carbon atoms can form long chains.
- Only P is correct.
- Only Q is correct.
- Both P and R are correct.
- Both Q and R are correct.