The redox reaction among the following is

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(A) $N_2 + O_2 \xrightarrow{2000 \; K} 2 NO$ (Redox reaction)During the reaction,the oxidation state of nitrogen changes from $0$ to $+2$ (oxidation)

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

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(A) $N_2 + O_2 \xrightarrow{2000 \; K} 2 NO$ (Redox reaction)During the reaction,the oxidation state of nitrogen changes from $0$ to $+2$ (oxidation) and the oxidation state of oxygen changes from $0$ to $-2$ (reduction). Thus,it is a redox reaction.$3 O_2 \xrightarrow{hv} 2 O_3$ (Non-redox reaction)$H_2SO_4 + 2 NaOH \rightarrow Na_2SO_4 + 2 H_2O$ (Neutralization reaction,non-redox)$[Co(H_2O)_6]Cl_3 + 3 AgNO_3 \rightarrow 3 AgCl \downarrow + [Co(H_2O)_6](NO_3)_3$ (Precipitation reaction,non-redox)

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