Question

the total number of hybrid orbitals on central iodine in tri-iodide anion,

Answer 1

The answer is 5 that is the the total number of hybrid orbitals on central iodine in tri-iodide anion is 5.

The explanation is :

The hybridisation of tri-iodide anion is found to be sp³d.

The structure of tri-iodide anion is shown in the attached image.

1 s, 3 p and 2 d orbital combine to form 5 sp³d hybrid orbitals .

So here the number of hybrid orbital will be 5.