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JEE Advanced 2008Paper 1
Exam
JEE Advanced
Year
2008
Paper
Paper 1
Subject
Chemistry
Chapter
d and f Block Elements

JEE Advanced 2008 · Paper 1 · Chemistry · d and f Block Elements

A solution of colourless salt H on boiling with excess NaOH...

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

Options

  1. ANH4NO3\mathrm{NH}_4 \mathrm{NO}_3
  2. BNH4NO2\mathrm{NH}_4 \mathrm{NO}_2
  3. CNH4Cl\mathrm{NH}_4 \mathrm{Cl}
  4. D(NH4)2SO4\left(\mathrm{NH}_4\right)_2 \mathrm{SO}_4

Correct answer

A. NH4NO3\mathrm{NH}_4 \mathrm{NO}_3

Step-by-step solution

NH4NO3+NaOH⟶NaNO3+NH3+H2ONaNO3+8[H]NaOH+NH3+2H2ONH4NO2+NaOH⟶NaHO2+NH3+H2ONaNO2+6[H]⟶NaOH+NH3+H2O\begin{aligned}& \mathrm{NH}_{4} \mathrm{NO}_{3}+\mathrm{NaOH} \longrightarrow \mathrm{NaNO}_{3}+ \mathrm{NH}_{3}+\mathrm{H}_{2} \mathrm{O}\\ & \mathrm{NaNO}_{3}+8[\mathrm{H}] \mathrm{NaOH}+\mathrm{NH}_{3}+2 \mathrm{H}_{2} \mathrm{O}\\ & \mathrm{NH}_{4} \mathrm{NO}_{2}+\mathrm{NaOH} \longrightarrow \mathrm{NaHO}_{2}+ \mathrm{NH}_{3}+\mathrm{H}_{2} \mathrm{O}\\ & \mathrm{NaNO}_{2}+6[\mathrm{H}] \longrightarrow \mathrm{NaOH}+\mathrm{NH}_{3}+ \mathrm{H}_{2} \mathrm{O} \end{aligned}
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