pBlock ElementsII - Result Question 123
####8. The compound that does not produce nitrogen gas by the thermal decomposition is
(2018 Main)
(a) $Ba\left(N _3\right) _2$
(c) $NH _4 NO _2$
(b) $\left(NH _4\right) _2 Cr _2 O _7$
(d) $\left(NH _4\right) _2 SO _4$
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Solution:
- The thermal decomposition of given compounds is shown below
$$ \begin{gathered} \left(NH _4\right) _2 Cr _2 O _7 \stackrel{\Delta}{\longrightarrow} N _2+4 H _2 O+Cr _2 O _3 \ NH _4 NO _2 \stackrel{\Delta}{\longrightarrow} N _2+2 H _2 O \ \left(NH _4\right) _2 SO _4 \stackrel{\Delta}{\longrightarrow} 2 NH _3+H _2 SO _4 \ Ba\left(N _3\right) _2 \longrightarrow Ba+3 N _2 \end{gathered} $$
Thus, only $\left(NH _4\right) _2 SO _4$ does not gives $N _2$ on heating (It give $NH _3$ ). While rest of the given compounds gives $N _2$ on their thermal decomposition.
