Which are 2 allotropic forms of nitrogen?
Two allotropic forms of solid nitrogen exist, with the transition from the alpha to the beta form taking place at -237 deg C. When nitrogen is heated, it combines directly with magnesium, lithium, or calcium; when mixed with oxygen and subjected to electric sparks, it forms first nitric oxide (NO) and then the dioxide (NO2); when heated under pressure with a catalyst with hydrogen, ammonia is formed (Haber process).
