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Hydrogen cyanide (HCN), sometimes called prussic acid, is an organic compound with the chemical formula HCN. It is a colorless, extremely poisonous and flammable liquid that boils slightly above room temperature, at 25.6 Â°C (78.1 Â°F).
HCl or Hydrogen chloride is a colour less gas at room temperature.Upon contact with water vapour it forms white fumes of HCl acid.Both gas and liquid form has same formula. So the word HCl is abstract.