Carbon dioxide is a gas while silica is a solid because .......

  • A
    Carbon dioxide consists of discrete covalent $CO_2$ molecules,whereas silica has a continuous tetrahedral structure.
  • B
    $CO_2$ molecules are lighter than $SiO_2$ molecules.
  • C
    $CO_2$ is more acidic than $SiO_2$.
  • D
    The melting point of silica is very high.

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