Redox Reactions - Result Question 2
####2. Which of the following involves a redox reaction?
(a) Reaction of $H_2 SO_4$ with $NaOH$ [1997]
(b) Production of ozone from oxygen in the atmosphere by lightning
(c) Production of nitrogen oxides from nitrogen and oxygen in the atmosphere by lightning
(d) Evaporation of water
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Solution:
(c) (a) $2 NaOH+H_2 SO_4 \longrightarrow Na_2 SO_4+2 H_2 O$ (neutralization)
(b) $\stackrel{0}O_2 \xrightarrow{\text{ Light }} 2 \stackrel{0}O_3$ (not redox reaction)
(c) $\underset{0}{N_2}+\underset{0}{O_2} \xrightarrow{\text{ Light }} \underset{+2-2}{2 NO}$ (redox reaction) here oxidation of $N_2$ & reduction of $O_2$ is taking place
(d) $H_2 O$ (l) $\xrightarrow{\Delta} H_2 O$ (g) (not redox reaction)
