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 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.
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