Select correct statement(s): (I) When excess FeCl3 solution is added to K4[Fe(CN)6] solution, in add — Qualitative and Quantitative Analysis Chemistry Question
Question
Select correct statement(s): (I) When excess FeCl3 solution is added to K4[Fe(CN)6] solution, in addition to FeIII[FeII(CN)6]-, FeII[FeIII(CN)6]- is also formed due to side redox reaction. (II) When FeCl2 is added to K3[Fe(CN)6] solution, in addition to FeII[FeIII(CN)6]-, FeIII[FeII(CN)6]- is also formed due to side redox reaction. (III) FeIII[FeII(CN)6]- is paramagnetic while FeII[FeIII(CN)6]- is diamagnetic. (IV) FeIII[FeII(CN)6]- is diamagnetic while FeII[FeIII(CN)6]- is paramagnetic.
Answer: A
💡 Solution & Explanation
Both Prussian blue and Turnbull's blue are essentially the same compound due to a side redox equilibrium between the Fe2+/Fe3+ and [Fe(CN)6]3-/[Fe(CN)6]4- couples upon mixing. Thus, both statements I and II are correct.
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