Chemistry - Coordination Chemistry Question with Solution | TestHub

Mond's process forms nickel tetracarbonyl, Ni(CO)₄.

Ni is in $0$ oxidation state (d¹⁰), so all electrons are paired and the complex is diamagnetic. It follows the 18-electron rule ($10+4\times 2=18$). The complex has tetrahedral geometry, not square planar, and is highly volatile (b.p. $\approx 43^{\circ }$C).