Coordination CompoundHard

Question

Which of the following pairs of name and formula of complexes, is correct ?

Options

A.Tetramminecopper(II) sulphate...... [Cu(NH3)4]SO4
B.Diamminesilver(I) chloride ........ [Ag(NH3)2]Cl
C.Potassium hexacyanidoferrate (III) .......K4[Fe(CN)6]
D.Potassium amminepentachloridoplatinate (IV).......... K[PtCl5(NH3)]

Solution

(C) It is not correct formula because the Fe is in +3 oxidation state and as such formula should be [Fe3+(CN)6]3- or K3[Fe(CN)6].

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