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Account for the following (i) Co(II) ...

Account for the following
(i) `Co(II)` is stable in aqueous solution but in the presence of strong ligand and air , it can get oxidized to `Co(III)` .
(ii) `[Ni(CN)_(4)]^(2-)` is square planar and diamagnetic whereas `[NiCl_(4)]^(2-)` is tetrahedral and paramagnetic .

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To address the question, we will break it down into two parts as specified. ### Part (i): Stability of Co(II) in Aqueous Solution and Oxidation to Co(III) 1. **Understanding the Electronic Configuration**: - Cobalt (Co) has an atomic number of 27. Its electronic configuration is: \[ \text{Co: } [Ar] 4s^2 3d^7 ...
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Account for the following statements : (i) Co (ii) is stable in aqueous solution but in the presence of strong ligands and air it can get oxidised to Co (III) (at. No Co=27) (ii) of the d^4 species Cr (II) is strongly reducing but Mn (III) is strongly oxidising (at. no Cr= 24 , Mn = 25, Co = 27)

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Explain the following giving reasons [NiCI_(4)]^(2-) is tetrahedral and paramagnetic whereas [Ni(CN)_(4)]^(2-) is square plannar and dimagnetic.

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Why Ni(CO_2)_4 is tetrahedral while [Ni(CN)_4]^(2-) is square planar?

How and you account for the following : (i) Cabalt (II) is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised. (ii) The transition elements exhibit high enthalpy of atomization. (iii) of the d^4 species, Cr^(2+) is strongly reducing while Mn (III) is strongly oxidsing .

Give the correct of initials T or F for following statements. Use T if statements is true and F if it is false. (I) Co(III) is stabilised in presence of weak field ligands, while Co(II) is stabilised in presence of strong field ligand. ((II) Four coordinated complexes of Pd(II) and Pt(II) are diamagnetic and square planar. (III) [Ni(CN)_(4)]^(4-) ion and [Ni(CO)_(4)] are diamagnetic tetrahedral and square planar respectively. (IV) Ni^(2+) ion does not form inner orbital octahedral complexes

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Give reason for the fact that amongst Ni(CO)_(4)[Ni(CN)_(4)]^(2-) and NiCI_(4)^(2-), Ni(CO)_(4) and [Ni(CN)_(4)]^(2-) are diamagnetic whereas [NiCI_(4)]^(2) is paramagnetic are diamagnetic whereas [NiCI_(4)]^(2) is paramagnetic .

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