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(D) In the reaction $N_2 + 3H_2 \longrightarrow 2NH_3$,the oxidation state of $N$ changes from $0$ in $N_2$ to $-3$ in $NH_3$ (reduction).The oxidatio

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for either thermal combination redox reaction or thermal decomposition redox reaction.

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(D) In the reaction $N_2 + 3H_2 \longrightarrow 2NH_3$,the oxidation state of $N$ changes from $0$ in $N_2$ to $-3$ in $NH_3$ (reduction).The oxidation state of $H$ changes from $0$ in $H_2$ to $+1$ in $NH_3$ (oxidation).Since two different elements are undergoing oxidation and reduction to form a single product,this is a combination redox reaction.Specifically,it is a thermal combination redox reaction where two elements combine to form a compound.Therefore,the correct classification is $D$.

Assign $A, B, C, D$ from the given type of reaction for the following chemical equation:
$N_2 + 3H_2 \longrightarrow 2NH_3$

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Assign $A, B, C, D$ from the given type of reaction for the following chemical equation:$N_2 + 3H_2 \longrightarrow 2NH_3$