Qualitative Analysis - Result Question 28

28. A solution of colourless salt $H$ on boiling with excess $NaOH$ produces a non-flammable gas. The gas evolution ceases after sometime. Upon addition of $Zn$ dust to the same solution, the gas evolution restarts. The colourless salt(s) $H$ is (are)

(2008,4 M)

(a) $NH _4 NO _3$

(b) $NH _4 NO _2$

(c) $NH _4 Cl$

(d) $\left(NH _4\right) _2 SO _4$

Show Answer

Answer:

Correct Answer: 28. (a,b)

Solution:

$NH _4 NO _3+NaOH \longrightarrow NaNO _3+NH _3+H _2 O$

$NH _4 NO _2+NaOH \longrightarrow NaNO _2+NH _3+H _2 O$

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