Chemistry - Coordination Chemistry Question with Solution | TestHub

The alloy reacts with H₂O to give an alkaline solution (NaOH) and gas (H₂), identifying M₁ as Na and M₂ as Hg (Sodium amalgam). Mercury (M₂) reacts with concentrated HNO₃ to form Mercuric nitrate, Hg(NO₃)₂, labeled as solution (S₃). Adding excess KI to (S₃) forms the soluble complex K₂[HgI₄] (Nessler's Reagent base), which is solution (S₄). In the complex ion $[Hg{I}_4{]}^{2-}$, Hg²⁺ has a $d^{10}$ configuration ($5d^{10}6s^0$); since the $d$-orbitals are full, it undergoes sp³ hybridization to form a tetrahedral geometry.

Correct Option: (C) sp³