Answer: Square planar.
- A Square planar
- B Tetrahedral
- C Octahedral
- D Linear
Correct answer: A. Square planar
Explanation: [Ni(CN)4]2- is square planar; CN- is a strong field ligand that forces dsp<sup>2</sup> hybridisation on Ni<sup>2+</sup> (d<sup>8</sup> configuration).
The three common coordination geometries: octahedral (6 ligands), tetrahedral (4 ligands), and square planar (4 ligands in one plane).
Concept context
Study of compounds where a central metal atom is bonded to surrounding ligands. Covers nomenclature, types of isomerism, bonding theories (VBT, CFT), and applications in medicine, photography, and industry.