Nitrogen and hydrogen combine to form ammonia under high tempreture and pressure conditions. This is an example of
A
Biological N2 fixation
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B
Natural N2 fixation
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C
Industrial N2 fixation
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D
Electrical N2 fixation
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Solution
The correct option is B Natural N2 fixation During lightning, the high temperatures and pressures created in the air convert nitrogen into oxides of nitrogen. These oxides dissolve in water to give nitric and nitrous acids and fall on land along with rain. These are then utilised by various life- forms.