Transition and InnerTransition Elements - Result Question 29
####30. $\left(NH _4\right) _2 Cr _2 O _7$ on heating gives a gas which is also given by
(a) heating $NH _4 NO _2$
$(2004,1 M)$
(b) heating $NH _4 NO _3$
(c) $Mg _3 N _2+H _2 O$
(d) $Na$ (comp.) $+H _2 O _2$
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Solution:
- Ammonium dichromate on heating produces $N _2(g)$. $NH _4 NO _2$ also gives $N _2$ on heating :
$$ \begin{gathered} \left(NH _4\right) _2 Cr _2 O _7 \stackrel{\Delta}{\longrightarrow} N _2+Cr _2 O _3+4 H _2 O \ NH _4 NO _2 \stackrel{\Delta}{\longrightarrow} N _2+2 H _2 O \end{gathered} $$
