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Chemistry Question on coordination compounds

In which of the following octahedral complexes of Co (At. no. 27), will the magnitude of Δ0\Delta_{0} be the highest?

A

[Co(CN)6]3−[Co(CN)_6]^{3-}

B

[Co(C2O4)3]3−[Co(C_2O_4)_3]^{3-}

C

[Co(H2O)6]3+[Co(H_2O)_6]^{3+}

D

[Co(NH3)6]3+[Co(NH_3)_6]^{3+}

Answer

[Co(CN)6]3−[Co(CN)_6]^{3-}

Explanation

Solution

Spectrochemical series. According to the strength of splitting is as :
CO>CN−>NO2−>en>NH3>py>NCS−CO > CN^{-} > NO^{-}_{2} > en > NH_{3} > py > NCS^{-}
>H2O>O2−>oX2−>OH−>F>Cl−> H_{2}O > O^{2-} > oX^{2-} > OH^{-} > F > Cl^{-}
>SCN−>S2−>Br−>I−> SCN^{-} > S^{2-} > Br^{-} > I^{-}
Crystal field stabilisation energy (CFSE) foroctahedral complex, Δ∘\Delta^{\circ} depends on the strengthof negative ligand. [Higher the strength morewill be the CFSE]