Question

The redox reaction among the following is:

• A. formation of ozone from atmospheric oxygen in the presence of sunlight
• B. reaction of $\left[Co\right(H_{2}O{)}_6]C{l}_3$ with $AgN{O}_3$
• C. reaction of $H_{2}S{O}_4$ with $NaOH$
• D. combination of dinitrogen with dioxygen at $2000K$

Answer 1

The correct option is D combination of dinitrogen with dioxygen at $2000K$

Combination of dinitrogen with dioxygen at $2000K$

$N_{2\left(g\right)}+O_{2\left(g\right)}\to 2N{O}_{\left(g\right)}$

Oxidation state of $N$ in $N_2=0$
Oxidation state of $N$ in $NO=+2$

Oxidation state of $O$ in $O_2=0$
Oxidation state of $O$ in $NO=-2$

Here, the oxidation state of $N$ is changing from zero or native state to $+2$ state and for oxygen it is changing from $0$ to $-2$ state. Therefore $N$ is getting oxidised and $O$ is getting reduced. Hence, combination of dinitrogen with dioxygen is a redox reaction.