The compound(s) which generate(s) N 2 gas upon thermal decomposition below 300 ° C is (are)

Chemistry · p-Block Elements (Group 15-18)

JEE Advanced 2018 — Paper 1 — Question 15

The compound(s) which generate(s) $\mathrm{N}_{2}$ gas upon thermal decomposition below $300^{\circ} \mathrm{C}$ is (are)

Option A:
$\mathrm{NH}_{4} \mathrm{NO}_{3}$
Option B:
$\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$
Correct
Option C:
$\mathrm{Ba}\left(\mathrm{N}_{3}\right)_{2}$
Correct
Option D:
$\mathrm{Mg}_{3} \mathrm{~N}_{2}$

Answer: B, C

Step-by-step solution

(a) $\mathrm{NH}_{4} \mathrm{NO}_{3} \xrightarrow{\Delta} \mathrm{~N}_{2} \mathrm{O}+2 \mathrm{H}_{2} \mathrm{O} \quad\left(\mathrm{N}_{2} \mathrm{O}\right.$ can further decompose to $\mathrm{N}_{2}$ and $\mathrm{O}_{2}$ at temperature above

$300^{\circ} \mathrm{C}$ )

(b) $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \xrightarrow{\Delta} \mathrm{~N}_{2}+\mathrm{Cr}_{2} \mathrm{O}_{3}+4 \mathrm{H}_{2} \mathrm{O}$

(d) $\mathrm{Mg}_{3} \mathrm{~N}_{2}$ does not decompose at any temperature.

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Exam: JEE Advanced 2018
Paper: Paper 1
Subject: Chemistry
Chapter: p-Block Elements (Group 15-18)
Topic: Compounds of Nitrogen - preparation and properties

B ased on the compounds of group 15 elements, the correct statement(s) is (are)

Answer: B, C

Step-by-step solution

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