Metal Complexes, Rare Earth Elements and Metal Alloys

What is chelate? Using VBT, predict the geometry and magnetic property of [CoF₄]⁻. Write the formula of the following coordination compounds: i) Triamminetriaquachromium (III) chloride; ii) Potassium trioxalatoaluminate (III).

On the basis of VBT, explain the structure and hybridization involved in [Ni(CO)₄]. Write the IUPAC names of the following complexes: i) [Cr(en)₃]Br₃; ii) [Cr(H₂O)₅Cl]Cl₂; iii) K₃[AlF₆]; iv) [Cr(NH₃)₄SO₄]NO₃.

[NiCl₄]²⁻ is tetrahedral and paramagnetic while [Ni(CN)₄]²⁻ is square planar and diamagnetic. Explain with reference to VBT. Write the IUPAC name of the following complexes: i) Na₃[AgF₄]; ii) [Co(en)₃]Br₃.