The combination of two or more gases results in Gas Mixtures and most of these have been developed for specific reasons.
Nitrogen is significantly important to the chemical industry where it is used to make fertilisers, nitric acid, nylon, dyes and explosives. In order to make these products, nitrogen must first be reacted with hydrogen to produce ammonia which is done by the Haber process.
Xenon is a trace gas found in the Earth’s atmosphere and is rare. It is a noble gas that emits a blue or lavender coloured glow which makes it useful for illumination via lamps. It is used to manufacture certain specific drugs used in cancer treatments, it is filled in television and radio tubes as well.
Neon is the second-lightest noble gas and poses no real threat to the environment because it’s chemically unreactive and forms no compounds, however, it is a simple asphyxiant. The colours emitted in neon lights are used to make signs used for advertisement.
Krypton is a rare atmospheric gas present in the air at about 1 ppm and as such is non-toxic and is chemically inert and classified as a simple asphyxiant. It is used in medicine to detect abnormal heart openings, in very high-powered electric arc lights used at airports and in some strobo-lamps, because it has an extremely fast response to electric current.