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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

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