The redox reaction among the following is

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MCQ

✓
Combination of dinitrogen with dioxygen at $2000 \;K$
B
Formation of ozone from atmosphereic oxygen in the presence of sunlight
C
Reaction of $\mathrm{H}_{2} \mathrm{SO}_{4}$ with $\mathrm{NaOH}$
D
Reaction of $\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{3}$ with $\mathrm{AgNO}_{3}$

✓

Answer

Correct option: A.

Combination of dinitrogen with dioxygen at $2000 \;K$

a
$\mathrm{N}_{2}+\mathrm{O}_{2} \stackrel{2000 \mathrm{K}}{\longrightarrow} 2 \mathrm{NO} \quad$ (Redox reaction)

during the reaction, oxidation of nitrogen take place from $0$ to $2$ and reduction of oxygen take place from $0$ to $-2 .$ It means this reaction is redox reaction.

$3 \mathrm{O}_{2} \stackrel{\mathrm{hv}}{\longrightarrow} 2 \mathrm{O}_{3} \quad$ (Non - redox reaction)

$\mathrm{H}_{2} \mathrm{SO}_{4}+2 \mathrm{NaOH} \rightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}+2 \mathrm{H}_{2} \mathrm{O}$ (neutralization reaction)

$\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{3}+3 \mathrm{AgNO}_{3}$

$\rightarrow 3 \mathrm{AgCl} \downarrow+\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]\left(\mathrm{NO}_{3}\right)_{3}$

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