Select correct statement(s):

CHEMISTRY · Single correct · A Level · Chemistry · Transition metals and their chemistry · Transition metals and their chemistry

Problem

Select correct statement(s): (I) When excess FeCl3\text{FeCl}_3 solution is added to K4[Fe(CN)6]\text{K}_4[\text{Fe}(\text{CN})_6] solution, in addition to FeIII[FeII(CN)6]−\text{Fe}^{\text{III}}[\text{Fe}^{\text{II}}(\text{CN})_6]^-, FeII[FeIII(CN)6]−\text{Fe}^{\text{II}}[\text{Fe}^{\text{III}}(\text{CN})_6]^- is also formed due to side redox reaction (II) When FeCl2\text{FeCl}_2 is added to K3[Fe(CN)6]\text{K}_3[\text{Fe}(\text{CN})_6] solution, in addition to FeII[FeIII(CN)6]−\text{Fe}^{\text{II}}[\text{Fe}^{\text{III}}(\text{CN})_6]^-, FeIII[FeII(CN)6]−\text{Fe}^{\text{III}}[\text{Fe}^{\text{II}}(\text{CN})_6]^- is also formed due to side redox reaction (III) FeIII[FeII(CN)6]−\text{Fe}^{\text{III}}[\text{Fe}^{\text{II}}(\text{CN})_6]^- is paramagnetic while FeII[FeIII(CN)6]−\text{Fe}^{\text{II}}[\text{Fe}^{\text{III}}(\text{CN})_6]^- is diamagnetic (IV) FeIII[FeII(CN)6]−\text{Fe}^{\text{III}}[\text{Fe}^{\text{II}}(\text{CN})_6]^- is diamagnetic while FeII[FeIII(CN)6]−\text{Fe}^{\text{II}}[\text{Fe}^{\text{III}}(\text{CN})_6]^- is paramagnetic (1) I, II (2) III, IV (3) both (a) and (b) (4) None of these

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