What is the oxidation state of chromium in the final product when KI reacts with acidified potassium dichromate solution?

Which of the following series of transition elements has general electronic configuration, $[\text{Kr}]\,4d^{1-10}\,5s^{0-2}$?

Identify the ionization isomer of $[\text{Cr}(\text{H}_2\text{O})_4\,\text{Cl}(\text{NO}_2)]\,\text{Cl}$ from the following.

The number of ligands which are directly bonded to the metal is known as