Carbon and Its Compounds Exemplar Problems MCQ I

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Exemplar Problems MCQ I

  • Carbon exists in the atmosphere in the form of
    • carbon monoxide only
    • carbon monoxide in traces and carbon dioxide
    • carbon dioxide only
    • coal

      Answer: (c) Carbon dioxide only

      Explanation: Carbon monoxide is produced from volcanoes and from oxidation of petroleum products. However, carbon monoxide is short-lived and is eventually oxidized into carbon dioxide.
  • A molecule of ammonia (NH3) has
    • only single bonds
    • only double bonds
    • only triple bonds
    • two double bonds and one single bond

      Answer: (a) Only single bonds

      Explanation: Nitrogen’s valency is 3 and hence one atom of nitrogen combines with three atoms of hydrogen in a molecule of ammonia.

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