Which of the following is redox reaction

MCQ

A
${H_2}S{O_4}$ with $NaOH$
B
In atmosphere, ${O_3}$ from ${O_2}$ by lightning
C
Evaporation of ${H_2}O$
✓
Nitrogen oxides form nitrogen and oxygen by lightning

✓

Answer

Correct option: D.

Nitrogen oxides form nitrogen and oxygen by lightning

d
$\mathop {2{N_2}}\limits^0 + \mathop {{O_2}}\limits^{0{\mkern 1mu} {\mkern 1mu} } \to \mathop {\mathop {2N}\limits^{{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} + 2} {\mkern 1mu} \mathop {{\text{ }}O}\limits^{ - 2} }\limits^{\mkern 1mu} $

Here $O.N.$ of $N$ increases from $O$ in ${N_2}$ to $+2 $ in $NO, 2- $ and that of decreased from $O$ in ${O_2}$ to $-2 $ in $O,$ therefore, it is a redox reaction.

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