Diamond is hard because ...

  • A
    It is a giant molecule.
  • B
    It cannot be burnt.
  • C
    It is made of carbon atoms.
  • D
    Each carbon atom is bonded to four other carbon atoms by covalent bonds.

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Arrange the following forces in the increasing order of their interaction energy:
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Sodium sulphate is soluble in water whereas barium sulphate is sparingly soluble because

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