In the given chemical reaction, colors of the $\mathrm{Fe}^{2+}$ and $\mathrm{Fe}^{3+}$ ions, are respectively: \[ 5 \mathrm{Fe}^{2+}+\mathrm{MnO}_{4}^{-}+8 \mathrm{H}^{+} \longrightarrow \mathrm{Mn}^{2+}+4 \mathrm{H}_{2} \mathrm{O}+5 \mathrm{Fe}^{3+} \]

JEE Main · 2021 · 01 Sep 2021 · Shift 2 · d and f Block Elements

In the given chemical reaction, colors of the

Fe^{2 +}

and

Fe^{3 +}

ions, are respectively:

5 Fe^{2 +} + MnO_{4}^{-} + 8 H^{+} ⟶ Mn^{2 +} + 4 H_{2} O + 5 Fe^{3 +}

Answer: (B)

The hydrated iron(II) ion,

[Fe (H_{2} O)_{6}]^{2 +}

, is pale green, while the hydrated iron(III) ion,

[Fe (H_{2} O)_{6}]^{3 +}

, is yellow. The colours of

F e^{2 +}

and

F e^{3 +}

are green and yellow respectively.

JEE Main · 2021 · 01 Sep 2021 · Shift 2 · Single correct option