Easy MCQ +4 / -1 PYQ · JEE Mains 2022

Which statement is not true with respect to nitrate ion test?

  1. A A dark brown ring is formed at the junction of two solutions.
  2. B Ring is formed due to nitroferrous sulphate complex. Correct answer
  3. C The brown complex is [Fe(H<sub>2</sub>O)<sub>5</sub> (NO)]SO<sub>4</sub>.
  4. D Heating the nitrate salt with conc. H<sub>2</sub>SO<sub>4</sub>, light brown fumes are evolved.

Solution

Brown ring test <br/><br/> $$ \begin{aligned} &\mathrm{NO}_{3}^{-}+3 \mathrm{Fe}^{+2}+4 \mathrm{H}^{+} \rightarrow \mathrm{NO}+3 \mathrm{Fe}^{+3}+2 \mathrm{H}_{2} \mathrm{O} \\\\ &{\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \mathrm{NO} \rightarrow \underset{\text{Brown ring}}{\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5} \mathrm{NO}]^{2+} \mathrm{H}_{2} \mathrm{O}\right.}} \end{aligned} $$

About this question

Subject: Chemistry · Chapter: Coordination Compounds · Topic: Ligands and Coordination Number

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