181. What is crystal field splitting energy? How does the magnitude of Δ₀ decide the actual configuration of d orbitals in a coordination entity?

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182. [Cr(NH₃)₆)³⁺ is paramagnetic while [Ni(CN)₄]^{2 –} is diamagnetic. Explain why?

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183.

Discuss the nature of bonding in metal carbonyls.

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184.

Give the oxidation state, d-orbital occuptaion and coordination number of the central metal ion in the following complexes:
K₃[Co(C₂O₄)₃]

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185.

Give the oxidation state, d-orbital occuptaion and coordination number of the central metal ion in the following complexes:
cis-[Cr(en) ₂Cl₂]Cl

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186.

Give the oxidation state, d-orbital occuptaion and coordination number of the central metal ion in the following complexes:
(NH₄)₂[CoF₄]

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187.
Give the oxidation state, d-orbital occuptaion and coordination number of the central metal ion in the following complexes:
[Mn(H₂O)₆SO₄

The central metal ion is Mn.
The coordination number is 6.
Water is neutral ligand thus oxidation state is:

X+0 =+2
X= +2

Oxidation state = +2
d-orbital occupation is $d^{5} (t_{2 g}^{3} e {_{g}}^{2})$

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188.

Write down the IUPAC name for each of the following complexes and indicate the oxidation state, electronic configuration & coordination number, Also give stereochemistry and magnetic moment of the complex:
K[Cr(H₂O)₂(C₂O₄)₂]. 3H₂O

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189.

Write down the IUPAC name for each of the following complexes and indicate the oxidation state, electronic configuration & coordination number, Also give stereochemistry and magnetic moment of the complex:
CrCl₃(py)₃

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190.

Write down the IUPAC name for each of the following complexes and indicate the oxidation state, electronic configuration & coordination number, Also give stereochemistry and magnetic moment of the complex:
Cs[FeCl₄].

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