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Ammonia is a colourless gas with a characteristic pungent smell. It is lighter than air, its density being 0.589 times that of air. It is easily liquefied due to the strong hydrogen bonding between molecules; the liquid boils at â33.3 Â°C (â27.94 Â°F), and freezes at â77.7 Â°C (â107.86 Â°F) to white crystals.
Appearance. The appearances of the members of the nitrogen group are not similar. Nitrogen being a gas, is colorless and odorless. Phosphorus is found in natural form in white, red and black solid structure.Arsenic exists as a solid with yellow and gray color.ppearance. The appearances of the members of the nitrogen group are not similar. Nitrogen being a gas, is colorless and odorless. Phosphorus is found in natural form in white, red and black solid structure.