Graphite
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Answer the following questions :
(a) Why is graphite a good conductor of electricity but not diamond ?
(b) Why is diamond very hard ?
(c) What are fullerenes ? Name the most common fullerene.
(d) What impurity is present in black diamond ?
Why does water molecules attract each other?
None of these
Oxygen - oxygen (neighboring molecule)
Hydrogen - oxygen bonding
Hydrogen - hydrogen bonding
Bond formation occurs when the energy of the system
decreases
increases
remains same
Which of the following is a good conductor of electricity: (a) diamond (b) graphite
Write 'true' or 'false' against the following statements :
(a) Carbon constitutes 0.03% of the earth's crust.
(b) Graphite is the purest form of carbon.
(c) Coloured diamonds are costlier than colourless and transparent diamonds.
(d) Graphite has layers of hexagonal carbon bondings.
(e) Diamond is insoluble in all solvents.
Name an allotrope of carbon which contains both single and double bonds between carbon atoms.
Graphite
Diamond
Fullerene
No allotrope meets such a condition
Graphite is a soft lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite
has Carbon atoms arranged in flat parallel layers of rings of strongly bound Carbon atoms with weak interlayer bonds.
is a noncrystalline substance
is an allotropic form of Carbon.
has the only a single bond between Carbon atoms.
Why is energy released when new bonds are formedin a chemical reaction?
What is the major content of lead pencil?
PbS
Graphite
FeS
Pb
The weak attractive forces that act on neutral atoms and molecules of the same type are collectively known as _____
Covalent bonding
Hydrogen bonding
Van der Waals forces
Electrostatic forces of attraction
Ishita wanted to select one of the allotropic forms of carbon as a lubricant for fast moving machinery parts. Which material should she use and why?
(Hint: Recall the structure and uses of crystalline forms of carbon.)
Diamond is made up of flat planar layers of atoms.
- True
- False
Which allotrope of carbon is also called a solid lubricant?
Diamond
- Lampblack
Graphite
Coal
C-C bond length is maximum in
diamond
graphite
naphthalene
fullerene
Is graphite also a allotrope of carbon?
Which of the given options has free electrons and can conduct electricity?
Diamond
Graphite
Wood
Rubber
Statement 1 : Graphite is used in dry cells that are present in electric motors.
Statement 2 : Graphite is a bad conductor of electricity.
- Statement 1 and statement 2 are true.
- Statement 1 and statement 2 are false.
- Statement 1 is true but statement 2 is false.
- Statement 1 is false but statement is true.
- graphite
- carbon
- diamond
- none of the above
Graphite is a non-metal and has very low melting and boiling points.
True
False
- Electrostatic forces of attraction
- Covalent bonding
- Hydrogen bonding
- Van der Waals forces
With respect to diamond and graphite, which of the statement(s) given below is/are correct?
Graphite is harder than diamond.
Graphite has higher electrical conductivity than diamond
Graphite has higher thermal conducitivity than diamond.
Graphite has higher C - C bond order than diamond
- None of these
- Diamond
- Fullerene
- Graphite
The incorrect statement related to allotropes of carbon is/are
Diamond is the hardest allotrope of carbon and having a three dimensional network structure of
Electrostatic force of attraction acts between the layers of graphite 6.14 Å away from each other
Graphite is the most stable allotropes of carbon and having a two dimensional sheet like structure of hexagonal rings of carbon
Fullerene (C60) is recently discovered non-crystalline allotrope of carbon having a football-like structure