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a
H2SO4 with NaOH
b
In atmosphere, O3 from O2 by lightning
c
Evaporation of H2O
d
Nitrogen oxides form nitrogen and oxygen by lightning
answer is D.
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Detailed Solution
2N20 + O20 → 2N+2O-2Here O.N. of N increases from 0 (in N2 ) to +2 (in NO) and O.N. of O decreases from 0(in O2 ) to -2 (in NO)Hence it is a redox reaction.