Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity ? 

(1) N2O5 

(2) NO2 

(3) N2

(4) NO

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1 Answers

(1) Nitrous oxide (N2O) occurs naturally in environment. In automobile engine, when fossil is burnt dinitrogen & dioxygen combine to yield NO & NO2.

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