II. Mention how the following gases are useful to us: 1. Nitrogen 2.Oxygen
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Nitrogen - it helps plants in nitrogen fixation cycle. .
Oxygen - it is very important to humans for breathing and animals also...
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Nitrogen is colourless, odourless and tasteless gas. ... Compared tonitrogen the oxygen reacts with most of the chemical elements. It is necessary for most living organisms for metabolic processes. It also accelerates fire, which is useful for steel and glass industry.
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