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QJEEM22Chd7c5: JEE Main 2022 Chemistry - Class 12 JEEM22Chd7c5 Solution: Which statement is not true with respect to nitrate ion test?

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

Multiple Choice Options

  • A A dark brown ring is formed at the junction of two solutions.
  • B Ring is formed due to nitroferrous sulphate complex.
  • C The brown complex is [Fe(H2O)5 (NO)]SO4.
  • D Heating the nitrate salt with conc. H2SO4, light brown fumes are evolved.

Step-by-Step Verified Solution

Brown ring test

amp;NO3−+3Fe+2+4H+→NO+3Fe+3+2H2Oamp;[Fe(H2O)6]2+NO→[Fe(H2O)5NO]2+H2OBrown ring\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}

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