Chemistry - GENERAL CHEMISTRY Question with Solution | TestHub

Reaction: Reducing K₂[Ni(CN)₄] with metallic potassium (K) in liquid NH₃ forms complex 'P', which is K₄[Ni(CN)₄].

Hybridization: The anionic part is $[Ni(CN{)}_4{]}^{4-}$, where Ni is in a 0 oxidation state ($3d^{10}$) and exhibits sp³ hybridization with a tetrahedral geometry.

Geometry: Each C≡N ligand is linear, meaning the Ni—C≡N atoms form a straight line pointing toward the corners of a tetrahedron.

Planarity: A single plane can pass through the central Ni atom and two tetrahedral corners, containing both linear —C≡N groups.

Count: This plane contains $1Ni+2C+2N=5$ atoms in total, while the remaining two ligands lie outside this plane.