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(D) The given reaction is $Ba(N_3)_2 \xrightarrow{\Delta} Ba + 3N_2 \uparrow$.In this reaction,the oxidation state of $Ba$ is $+2$ in $Ba(N_3)_2$ and

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

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(D) The given reaction is $Ba(N_3)_2 \xrightarrow{\Delta} Ba + 3N_2 \uparrow$.In this reaction,the oxidation state of $Ba$ is $+2$ in $Ba(N_3)_2$ and $0$ in $Ba$ (reduction).The oxidation state of $N$ in $N_3^-$ is $-1/3$ and it becomes $0$ in $N_2$ (oxidation).Since a single reactant $Ba(N_3)_2$ breaks down into simpler substances upon heating,it is a thermal decomposition reaction.Since both oxidation and reduction are occurring,it is a thermal decomposition redox reaction.Therefore,the correct option is $D$.

Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$Ba(N_3)_2 \xrightarrow{\Delta} Ba + 3N_2 \uparrow$

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Assign $A$,$B$,$C$,$D$ from the given type of reaction.$Ba(N_3)_2 \xrightarrow{\Delta} Ba + 3N_2 \uparrow$