EASY
Earn 100

Name the following:

It is used to make pencil lead: _____.

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Important Questions on Carbon: An important element

EASY
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
One of the following is not an allotrope of carbon. This is:
EASY
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
State any two uses of diamond.
MEDIUM
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
Give any two differences between the properties of diamond and graphite. What causes these differences?
EASY
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
Buckminsterfullerene is an allotropic form of the element:
MEDIUM
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
State any two uses of graphite.
MEDIUM
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
Name the black substance of pencil. Will the current flow through the electrical circuit when we use the sharpened ends of the pencil to complete the circuit?
HARD
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
Write two points of difference in the structures of diamond and graphite.
MEDIUM
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
What is buckminsterfullerene? How is it related to diamond and graphite?
HARD
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
Explain why, diamond has a high melting point.
MEDIUM
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
How can diamonds be made artificially? How do synthetic diamonds differ from natural ones?
HARD
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
Describe the structure of graphite with the help of a labelled diagram.
EASY
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
Why is graphite a good conductor of electricity but diamond is a non-conductor of electricity?
MEDIUM
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
How does graphite act as a lubricant?
EASY
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
A diamond-toothed saw is usually used for cutting:
MEDIUM
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
Why is diamond used for making cutting tools (like glass cutters) but graphite is not?
MEDIUM
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
Buckminsterfullerene is a spherical molecule in which 60 carbon atoms are arranged in interlocking hexagonal and pentagonal rings of carbon atoms.
(A) How many hexagons of carbon atoms are present in one molecule of buckminsterfullerene?
(B) How many pentagons of carbon atoms are present in one molecule of buckminsterfullerene ?
EASY
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
Name the three allotropic forms of carbon.
MEDIUM
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
Why is graphite used for making dry cell electrodes but diamond is not?
MEDIUM
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
Explain why diamond is hard while graphite is soft (though both are made of carbon atoms).
EASY
Science>Chemistry>Carbon: An important element>Carbon: Occurrence, properties and allotropes
What is graphite? Of what substance is graphite made?