QJEEAdv18Ch0185: JEE Advanced 2018 Chemistry - Class 12 JEEAdv18Ch0185 Solution: The compounds(s) which generate(s) gas upon thermal…

Question

Verified Solution • 2025–26 Session moderate

The compounds(s) which generate(s)

{N_2}

gas upon thermal decomposition below

{300^ \circ }C

is (are)

Accepted Answer

(A) $N{H_4}N{O_3}\mathrel{\mathop{\kern0pt\longrightarrow}\limits_{below\,300^\circ C}} {N_2}O + 2{H_2}O$

${N_2}O\mathrel{\mathop{\kern0pt\longrightarrow}\limits_{above\,600^\circ C}} {N_2} + {O_2}$

(B) $(N H_{4})_{2} C r_{2} O_{7} \overset{Δ}{⟶} N_{2} + C r_{2} O_{3} + 4 H_{2} O$

(C) $Ba{({N_3})_2}\mathrel{\mathop{\kern0pt\longrightarrow}\limits_{180^\circ C}^\Delta } Ba + 3{N_2}$

(D) $M{g_3}{N_2}\mathrel{\mathop{\kern0pt\longrightarrow}\limits_{above\,700^\circ C}} 3Mg + {N_2}$

Hence, only ${(N{H_4})_2}C{r_2}{O_7}$ and $Ba{({N_3})_2}$ can provide N₂ gas on heating below $300^\circ C$

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