Question

the process of conversion of free atmospheric nitrogen into useful nitrogen compound is called Nitrogen dash

Answer 1

The process of conversion of free atmospheric nitrogen into useful nitrogen compound is called "Nitrogen Fixation".

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Answer 2

'Nitrogen fixation'
Nitrogen fixation is a process by which nitrogen in the Earth's atmosphere is converted into ammonia (NH3) or other molecules available to living organisms.[1]Atmospheric nitrogen or molecular dinitrogen (N2) is relatively inert: it does not easily react with other chemicals to form new compounds. The fixation process frees nitrogen atoms from their triply bondeddiatomic form, N≡N, to be used in other ways.