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Standard XII
Chemistry
Allotropes of Carbon
Question

The extremely high melting point of diamond (carbon) may be explained by the :
  1. network covalent bonds
  2. ionic bonds
  3. hydrogen bonds
  4. none of the above
  5. Van der Waal's forces

A
network covalent bonds
B
Van der Waal's forces
C
ionic bonds
D
none of the above
E
hydrogen bonds
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Solution
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Diamond has a giant molecular structure. Each carbon atom is covalently bonded to four other carbon atoms. A lot of energy is needed to separate the atoms in diamond. This is because covalent bonds are strong, and diamond contains very many covalent bonds. This makes diamond's melting point and boiling point very high.
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The extremely high melting point of diamond (carbon) may be explained by the :
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Q2
In which molecule is van der Waals force most likely to be important in determining the melting point and the boiling point?

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(a) Explain why diamond has a high melting point.
(b) State any two uses of diamond.
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Q5

Explain the following :

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(c) Atoms combine by transfer and sharing of electrons (s).


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