Q.
Which of the following is redox reaction
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a
H2SO4 with NaOH
b
In atmosphere, O3 from O2 by lightning
c
Evaporation of H2O
d
Nitrogen oxide from nitrogen and oxygen by lighting
answer is D.
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Detailed Solution
(1) H +12S+6O-24+2Na+1O-2H+1→Na+12S+6O-24+2H+12O-2Not a redox reactionNeutralization reactions are not redox reactions.(2) 2O03→3O02not a redox reaction(3) H2O(l)→H2O(g)Physical change is not a redox reaction (4) N02+O02→2N+2O-2 it is a redox reaction