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Q.

Consider the following statements.(I) NO is formed from N2 and O2 when lightning occurs at high altitude.(II) NO is formed when N2 is oxidized by O3.(III) NO is oxidized to NO2 by O2 or by O3 in the stratosphere.(IV) N2O is formed by the reaction of N2 with O3 or with atomic oxygen in the upper atmosphere and also by microbiological process.Select the correct statement(s).

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a

I, III and IV

b

I, II and IV

c

II, IIl and IV

d

I, II and III

answer is A.

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Detailed Solution

NO is not formed by oxidation of N2 by O3N2 +O2  →   NOWhen lightning occurs thus (I) is correct.NO +O3  →   NO2  + O2in the stratosphere thus (lll) is correct.N2 +O3  →   N2O + O2N2 +O  →   N2OThus, (IV) is correct.Note:  NO2 is further oxidized to NO3− which is washed in rain water to soil and serves as fertilizer.
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